{"id":1626,"date":"2023-04-30T17:49:50","date_gmt":"2023-04-30T09:49:50","guid":{"rendered":"http:\/\/www.aiersheng.cc\/?p=1626"},"modified":"2023-04-30T17:51:25","modified_gmt":"2023-04-30T09:51:25","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.aiersheng.cc\/?p=1626","title":{"rendered":"\u6570\u636e\u5e93\u64cd\u4f5c"},"content":{"rendered":"<p><a href=\"https:\/\/www.aiersheng.cc\/wp-content\/uploads\/2023\/04\/2023043009511911.jpeg\"><img decoding=\"async\" src=\"https:\/\/www.aiersheng.cc\/wp-content\/uploads\/2023\/04\/2023043009511911.jpeg?x-oss-process=image\/format,webp\/quality,Q_19\" alt=\"\"\/><\/a>4\u5929<\/p>\n<p>\t\u6570\u636e\u5e93\u6982\u5ff5<\/p>\n<p>\tmysql navicat<\/p>\n<p>\tsql\u8bed\u53e5 \u67e5\u8be2<\/p>\n<p>\tmysql\u9ad8\u7ea7<\/p>\n<p>1\u3001\u6982\u5ff5<\/p>\n<p>\t1.1\u3001\u6570\u636e\u5e93\u7684\u4f5c\u7528<\/p>\n<p>\t\t\u7528\u6765\u5b58\u50a8\u6570\u636e\uff0c\u65b9\u4fbf\u67e5\u8be2<\/p>\n<p>\t1.2\u3001\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u6838\u5fc3\u662f\u7528\u4e8c\u7ef4\u8868\u5b58\u50a8\u6570\u636e<\/p>\n<p>\t\t\u884c\uff0c\u8bb0\u5f55\uff0c\u4ee3\u8868\u7684\u662f\u4e00\u6761\u4e8b\u7269\u7684\u4fe1\u606f<br \/>\n\t\t\u5217\uff0c\u5b57\u6bb5\uff0c\u4ee3\u8868\u4e00\u6761\u4e8b\u7269\u7684\u67d0\u4e00\u4e2a\u5c5e\u6027<\/p>\n<p>\t\t\u8868\u53ef\u4ee5\u5b58\u5f88\u591a\u884c<br \/>\n\t\t\u6570\u636e\u5e93\u53ef\u4ee5\u5b58\u5f88\u591a\u8868<\/p>\n<p>\t1.3\u3001SQL<\/p>\n<p>\t\t\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0cselect Select<\/p>\n<p>\t1.4\u3001MySQL<\/p>\n<p>\t\t\u745e\u5178\u516c\u53f8\u5f00\u53d1\uff0c\u88ab\u5356\u7ed9Sun\uff0cSun\u53c8\u88ab\u5356\u7ed9Oracle<\/p>\n<p>\t\t\u5f00\u6e90 \u514d\u8d39 \u652f\u6301\u591a\u5e73\u53f0<\/p>\n<p>2\u3001MySQL\u5b89\u88c5<\/p>\n<p>\t\u670d\u52a1\u7aef\uff1a\u4e0d\u80fd\u5e26\u4e2d\u6587\u8def\u5f84<\/p>\n<p>\t\t\u542f\u52a8  \u505c\u6b62  \u91cd\u542f<\/p>\n<p>\t\u5ba2\u6237\u7aef\uff1a<\/p>\n<p>\t\t\u547d\u4ee4\u884c\u5ba2\u6237\u7aef<\/p>\n<p>\t\tnavicat<\/p>\n<p>3\u3001navicat\u4f7f\u7528<\/p>\n<p>\t\u8fde\u63a5\u670d\u52a1\u7aef<\/p>\n<p>\t\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801<\/p>\n<p>\t\u6570\u636e\u5e93\u64cd\u4f5c <\/p>\n<p>\t\t\u521b\u5efa  \u5b57\u7b26\u96c6\u7528\u8fc7utf8<\/p>\n<p>\t\t\u7f16\u8f91  \u4e0d\u80fd\u6539\u540d\u79f0<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u8868<\/p>\n<p>\t\t\u521b\u5efa<\/p>\n<p>\t\t\u8bbe\u8ba1\u8868 <\/p>\n<p>\t\t\t\u6dfb\u52a0\u5b57\u6bb5<\/p>\n<p>\t\t\t\u4fee\u6539\u5b57\u6bb5<\/p>\n<p>\t\t\t\u5220\u9664\u5b57\u6bb5<\/p>\n<p>\t\t\u91cd\u547d\u540d<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u6dfb\u52a0 <\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\t\u4fee\u6539<\/p>\n<p>\t\t\u67e5\u8be2<\/p>\n<p>4\u3001\u6570\u636e\u7c7b\u578b\u4e0e\u7ea6\u675f<\/p>\n<p>\tint \uff1a \u6709\u7b26\u53f7\u8303\u56f4\uff08-2147483648 ~2147483647\uff09\uff0c\u65e0\u7b26\u53f7\u8303\u56f4\uff080 ~ 4294967295\uff09\uff0c\u957f\u5ea6\u6ca1\u6709\u610f\u4e49<\/p>\n<p>\tvarchar \uff1avarchar(3)\u8868\u793a\u6700\u591a\u5b583\u4e2a\u5b57\u7b26\uff0c\u4e00\u4e2a\u4e2d\u6587\u6216\u4e00\u4e2a\u5b57\u6bcd\u90fd\u5360\u4e00\u4e2a\u5b57\u7b26<\/p>\n<p>\tdecimal \uff1adecimal(5,2)\u8868\u793a\u5171\u5b585\u4f4d\u6570\uff0c\u5c0f\u6570\u53602\u4f4d\uff0c\u6574\u6570\u53603\u4f4d<\/p>\n<p>\t\u4e3b\u952e\uff1a\u5b57\u6bb5\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4e14\u4e0d\u80fd\u4e3anull\uff0c\u552f\u4e00\u6807\u8bc6\u67d0\u4e00\u6761\u6570\u636e\uff0c\u4e00\u822c\u5b57\u6bb5\u540d\u53ebid\uff0cint\u7c7b\u578b\u3001\u65e0\u7b26\u53f7\u3001\u81ea\u52a8\u9012\u589e<\/p>\n<p>5\u3001sql\u8bed\u8a00<\/p>\n<p>\t\u8868<\/p>\n<p>\t\t\u521b\u5efa\u8868<\/p>\n<p>\t\t\tcreate table \u8868\u540d(<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f,<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f<br \/>\n\t\t\t&#8230;<br \/>\n\t\t\t)<\/p>\n<p>\t\t\t&#8212; \u6ce8\u91ca ctrl + \/<br \/>\n\t\t\t&#8212; \u53d6\u6d88\u6ce8\u91ca ctrl + shift + \/<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)<\/p>\n<p>\t\t\t\tcreate table students(<br \/>\n\t\t\t\tname varchar(10)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84<\/p>\n<p>\t\t\t\tcreate table students2(<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84\uff0c\u8eab\u9ad8(\u4fdd\u7559\u5c0f\u6570\u70b92\u4f4d)<\/p>\n<p>\t\t\t\tcreate table students3(<br \/>\n\t\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned,<br \/>\n\t\t\t\theight decimal(5,2)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\u5220\u9664\u8868<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u4e0d\u5b58\u5728\uff0c\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table students<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u5b58\u5728\uff0c\u624d\u5220\u9664\uff0c\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table if exists students3;<\/p>\n<p>\t\t\tcreate table students3(<br \/>\n\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\tname varchar(10),<br \/>\n\t\t\tage int unsigned,<br \/>\n\t\t\theight decimal(5,2)<br \/>\n\t\t\t)<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u63d2\u5165\u6570\u636e<\/p>\n<p>\t\t\tinsert into \u8868\u540d values(&#8230;)<br \/>\n\t\t\t\u4f8b\uff1a\u63d2\u5165\u4e00\u4e2a\u5b66\u751f\uff0c\u8bbe\u7f6e\u6240\u6709\u5b57\u6bb5\u7684\u4fe1\u606f<\/p>\n<p>\t\t\t\tinsert into students3 values(0,&#8217;\u4e9a\u745f&#8217;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(default,&#8217;\u4e9a\u745f2&#8242;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u7ed9\u90e8\u5206\u5b57\u6bb5\u8bbe\u7f6e\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;)<\/p>\n<p>\t\t\t\tinsert into students3(name,age) values(&#8216;\u9c81\u73ed2&#8242;,30) <\/p>\n<p>\t\t\t\u6267\u884c\u591a\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f4&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f5&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f6&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u6267\u884c\u4e00\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;),(&#8216;\u9c81\u73ed2&#8217;),(&#8216;\u9c81\u73ed3&#8217;),(&#8216;\u9c81\u73ed4&#8242;)<\/p>\n<p>\t\t\u66f4\u65b0\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1aupdate \u8868\u540d set \u52171=\u503c1,\u52172=\u503c2&#8230; where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u4fee\u6539id\u4e3a5\u7684\u5b66\u751f\u6570\u636e\uff0c\u59d3\u540d\u6539\u4e3a \u72c4\u4ec1\u6770\uff0c\u5e74\u9f84\u6539\u4e3a 20<\/p>\n<p>\t\t\t\tupdate students3 set age=10 where id=5<\/p>\n<p>\t\t\t\tupdate students3 set name=&#8217;\u72c4\u4ec1\u6770&#8217;,age=22,height=123.246 where age=20<\/p>\n<p>\t\t\u5220\u9664\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1adelete from \u8868\u540d where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u5220\u9664id\u4e3a6\u7684\u5b66\u751f\u6570\u636e<\/p>\n<p>\t\t\tdelete from hero2 <\/p>\n<p>\t\t\tdelete from students3 where id=12<\/p>\n<p>\t\t\u903b\u8f91\u5220\u9664<\/p>\n<p>\t\t\t1\u3001\u7ed9\u8868\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u540d\u5b57\u53ebisdelete int\u7c7b\u578b \uff0c0\u4ee3\u8868\u672a\u5220\u9664\uff0c1\u4ee3\u8868\u5220\u9664<\/p>\n<p>\t\t\t2\u3001\u628a\u8868\u4e2d\u6240\u6709\u7684\u6570\u636eisdelete\u5b57\u6bb5\u6539\u4e3a0<\/p>\n<p>\t\t\t3\u3001\u60f3\u5220\u9664\u6570\u636e\u65f6\uff0c\u4f7f\u7528update\u8bed\u53e5\uff0c\u628a\u67d0\u6761\u6570\u636e\u7684isdelete\u5b57\u6bb5\u6539\u4e3a1<\/p>\n<p>\t\t\t\tupdate students3 set isdelete=1 where id=5<\/p>\n<p>\t\t\t4\u3001\u5728\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u53ea\u67e5\u8be2isdelete\u4e3a0\u7684\u6570\u636e<\/p>\n<p>\t\t\t\tselect * from students3 where isdelete=0<\/p>\n<p>4\u5929<\/p>\n<p>\t\u6570\u636e\u5e93\u6982\u5ff5<\/p>\n<p>\tmysql navicat<\/p>\n<p>\tsql\u8bed\u53e5 \u67e5\u8be2<\/p>\n<p>\tmysql\u9ad8\u7ea7<\/p>\n<p>1\u3001\u6982\u5ff5<\/p>\n<p>\t1.1\u3001\u6570\u636e\u5e93\u7684\u4f5c\u7528<\/p>\n<p>\t\t\u7528\u6765\u5b58\u50a8\u6570\u636e\uff0c\u65b9\u4fbf\u67e5\u8be2<\/p>\n<p>\t1.2\u3001\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u6838\u5fc3\u662f\u7528\u4e8c\u7ef4\u8868\u5b58\u50a8\u6570\u636e<\/p>\n<p>\t\t\u884c\uff0c\u8bb0\u5f55\uff0c\u4ee3\u8868\u7684\u662f\u4e00\u6761\u4e8b\u7269\u7684\u4fe1\u606f<br \/>\n\t\t\u5217\uff0c\u5b57\u6bb5\uff0c\u4ee3\u8868\u4e00\u6761\u4e8b\u7269\u7684\u67d0\u4e00\u4e2a\u5c5e\u6027<\/p>\n<p>\t\t\u8868\u53ef\u4ee5\u5b58\u5f88\u591a\u884c<br \/>\n\t\t\u6570\u636e\u5e93\u53ef\u4ee5\u5b58\u5f88\u591a\u8868<\/p>\n<p>\t1.3\u3001SQL<\/p>\n<p>\t\t\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0cselect Select<\/p>\n<p>\t1.4\u3001MySQL<\/p>\n<p>\t\t\u745e\u5178\u516c\u53f8\u5f00\u53d1\uff0c\u88ab\u5356\u7ed9Sun\uff0cSun\u53c8\u88ab\u5356\u7ed9Oracle<\/p>\n<p>\t\t\u5f00\u6e90 \u514d\u8d39 \u652f\u6301\u591a\u5e73\u53f0<\/p>\n<p>2\u3001MySQL\u5b89\u88c5<\/p>\n<p>\t\u670d\u52a1\u7aef\uff1a\u4e0d\u80fd\u5e26\u4e2d\u6587\u8def\u5f84<\/p>\n<p>\t\t\u542f\u52a8  \u505c\u6b62  \u91cd\u542f<\/p>\n<p>\t\u5ba2\u6237\u7aef\uff1a<\/p>\n<p>\t\t\u547d\u4ee4\u884c\u5ba2\u6237\u7aef<\/p>\n<p>\t\tnavicat<\/p>\n<p>3\u3001navicat\u4f7f\u7528<\/p>\n<p>\t\u8fde\u63a5\u670d\u52a1\u7aef<\/p>\n<p>\t\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801<\/p>\n<p>\t\u6570\u636e\u5e93\u64cd\u4f5c <\/p>\n<p>\t\t\u521b\u5efa  \u5b57\u7b26\u96c6\u7528\u8fc7utf8<\/p>\n<p>\t\t\u7f16\u8f91  \u4e0d\u80fd\u6539\u540d\u79f0<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u8868<\/p>\n<p>\t\t\u521b\u5efa<\/p>\n<p>\t\t\u8bbe\u8ba1\u8868 <\/p>\n<p>\t\t\t\u6dfb\u52a0\u5b57\u6bb5<\/p>\n<p>\t\t\t\u4fee\u6539\u5b57\u6bb5<\/p>\n<p>\t\t\t\u5220\u9664\u5b57\u6bb5<\/p>\n<p>\t\t\u91cd\u547d\u540d<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u6dfb\u52a0 <\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\t\u4fee\u6539<\/p>\n<p>\t\t\u67e5\u8be2<\/p>\n<p>4\u3001\u6570\u636e\u7c7b\u578b\u4e0e\u7ea6\u675f<\/p>\n<p>\tint \uff1a \u6709\u7b26\u53f7\u8303\u56f4\uff08-2147483648 ~2147483647\uff09\uff0c\u65e0\u7b26\u53f7\u8303\u56f4\uff080 ~ 4294967295\uff09\uff0c\u957f\u5ea6\u6ca1\u6709\u610f\u4e49<\/p>\n<p>\tvarchar \uff1avarchar(3)\u8868\u793a\u6700\u591a\u5b583\u4e2a\u5b57\u7b26\uff0c\u4e00\u4e2a\u4e2d\u6587\u6216\u4e00\u4e2a\u5b57\u6bcd\u90fd\u5360\u4e00\u4e2a\u5b57\u7b26<\/p>\n<p>\tdecimal \uff1adecimal(5,2)\u8868\u793a\u5171\u5b585\u4f4d\u6570\uff0c\u5c0f\u6570\u53602\u4f4d\uff0c\u6574\u6570\u53603\u4f4d<\/p>\n<p>\t\u4e3b\u952e\uff1a\u5b57\u6bb5\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4e14\u4e0d\u80fd\u4e3anull\uff0c\u552f\u4e00\u6807\u8bc6\u67d0\u4e00\u6761\u6570\u636e\uff0c\u4e00\u822c\u5b57\u6bb5\u540d\u53ebid\uff0cint\u7c7b\u578b\u3001\u65e0\u7b26\u53f7\u3001\u81ea\u52a8\u9012\u589e<\/p>\n<p>5\u3001sql\u8bed\u8a00<\/p>\n<p>\t\u8868<\/p>\n<p>\t\t\u521b\u5efa\u8868<\/p>\n<p>\t\t\tcreate table \u8868\u540d(<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f,<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f<br \/>\n\t\t\t&#8230;<br \/>\n\t\t\t)<\/p>\n<p>\t\t\t&#8212; \u6ce8\u91ca ctrl + \/<br \/>\n\t\t\t&#8212; \u53d6\u6d88\u6ce8\u91ca ctrl + shift + \/<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)<\/p>\n<p>\t\t\t\tcreate table students(<br \/>\n\t\t\t\tname varchar(10)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84<\/p>\n<p>\t\t\t\tcreate table students2(<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84\uff0c\u8eab\u9ad8(\u4fdd\u7559\u5c0f\u6570\u70b92\u4f4d)<\/p>\n<p>\t\t\t\tcreate table students3(<br \/>\n\t\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned,<br \/>\n\t\t\t\theight decimal(5,2)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\u5220\u9664\u8868<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u4e0d\u5b58\u5728\uff0c\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table students<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u5b58\u5728\uff0c\u624d\u5220\u9664\uff0c\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table if exists students3;<\/p>\n<p>\t\t\tcreate table students3(<br \/>\n\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\tname varchar(10),<br \/>\n\t\t\tage int unsigned,<br \/>\n\t\t\theight decimal(5,2)<br \/>\n\t\t\t)<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u63d2\u5165\u6570\u636e<\/p>\n<p>\t\t\tinsert into \u8868\u540d values(&#8230;)<br \/>\n\t\t\t\u4f8b\uff1a\u63d2\u5165\u4e00\u4e2a\u5b66\u751f\uff0c\u8bbe\u7f6e\u6240\u6709\u5b57\u6bb5\u7684\u4fe1\u606f<\/p>\n<p>\t\t\t\tinsert into students3 values(0,&#8217;\u4e9a\u745f&#8217;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(default,&#8217;\u4e9a\u745f2&#8242;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u7ed9\u90e8\u5206\u5b57\u6bb5\u8bbe\u7f6e\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;)<\/p>\n<p>\t\t\t\tinsert into students3(name,age) values(&#8216;\u9c81\u73ed2&#8242;,30) <\/p>\n<p>\t\t\t\u6267\u884c\u591a\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f4&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f5&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f6&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u6267\u884c\u4e00\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;),(&#8216;\u9c81\u73ed2&#8217;),(&#8216;\u9c81\u73ed3&#8217;),(&#8216;\u9c81\u73ed4&#8242;)<\/p>\n<p>\t\t\u66f4\u65b0\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1aupdate \u8868\u540d set \u52171=\u503c1,\u52172=\u503c2&#8230; where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u4fee\u6539id\u4e3a5\u7684\u5b66\u751f\u6570\u636e\uff0c\u59d3\u540d\u6539\u4e3a \u72c4\u4ec1\u6770\uff0c\u5e74\u9f84\u6539\u4e3a 20<\/p>\n<p>\t\t\t\tupdate students3 set age=10 where id=5<\/p>\n<p>\t\t\t\tupdate students3 set name=&#8217;\u72c4\u4ec1\u6770&#8217;,age=22,height=123.246 where age=20<\/p>\n<p>\t\t\u5220\u9664\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1adelete from \u8868\u540d where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u5220\u9664id\u4e3a6\u7684\u5b66\u751f\u6570\u636e<\/p>\n<p>\t\t\tdelete from hero2 <\/p>\n<p>\t\t\tdelete from students3 where id=12<\/p>\n<p>\t\t\u903b\u8f91\u5220\u9664<\/p>\n<p>\t\t\t1\u3001\u7ed9\u8868\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u540d\u5b57\u53ebisdelete int\u7c7b\u578b \uff0c0\u4ee3\u8868\u672a\u5220\u9664\uff0c1\u4ee3\u8868\u5220\u9664<\/p>\n<p>\t\t\t2\u3001\u628a\u8868\u4e2d\u6240\u6709\u7684\u6570\u636eisdelete\u5b57\u6bb5\u6539\u4e3a0<\/p>\n<p>\t\t\t3\u3001\u60f3\u5220\u9664\u6570\u636e\u65f6\uff0c\u4f7f\u7528update\u8bed\u53e5\uff0c\u628a\u67d0\u6761\u6570\u636e\u7684isdelete\u5b57\u6bb5\u6539\u4e3a1<\/p>\n<p>\t\t\t\tupdate students3 set isdelete=1 where id=5<\/p>\n<p>\t\t\t4\u3001\u5728\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u53ea\u67e5\u8be2isdelete\u4e3a0\u7684\u6570\u636e<\/p>\n<p>\t\t\t\tselect * from students3 where isdelete=0<\/p>\n<p>\t\u67e5\u8be2<\/p>\n<p>\t\t\u67e5\u8be2\u6240\u6709\u5b57\u6bb5<\/p>\n<p>\t\t\tselect * from \u8868\u540d<\/p>\n<p>\t\t\tselect * from students<\/p>\n<p>\t\t\u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5<\/p>\n<p>\t\t\tselect name,hometown from students<\/p>\n<p>\t\t\u7ed9\u5b57\u6bb5\u53d6\u522b\u540d<\/p>\n<p>\t\t\tselect name as \u59d3\u540d,hometown as \u5bb6\u4e61 from students<\/p>\n<p>\t\t\u7ed9\u8868\u53d6\u522b\u540d<\/p>\n<p>\t\t\tselect stu.name,stu.hometown from students as stu<\/p>\n<p>\t\t\u53bb\u91cd\uff0c\u91cd\u590d\u7684\u8bb0\u5f55\u53ea\u663e\u793a\u4e00\u6761\uff0c\u5f53\u663e\u793a\u7684\u4e00\u6574\u884c\u8bb0\u5f55\u8ddf\u53e6\u4e00\u6574\u884c\u8bb0\u5f55\u5b8c\u5168\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u91cd\u590d\u7684\u8bb0\u5f55<\/p>\n<p>\t\t\tselect distinct sex from students<\/p>\n<p>\t\t\tselect distinct sex,class  from students<\/p>\n<p>\t\u6bd4\u8f83\u8fd0\u7b97<\/p>\n<p>\t\t\u4f8b1\uff1a\u67e5\u8be2\u5c0f\u4e54\u7684\u5e74\u9f84<\/p>\n<p>\t\t\tselect age from students where name=&#8217;\u5c0f\u4e54&#8217;<\/p>\n<p>\t\t\u4f8b2\uff1a\u67e5\u8be220\u5c81\u4ee5\u4e0b\u7684\u5b66\u751f<\/p>\n<p>\t\t\tselect * from students where age<=20\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u5bb6\u4e61\u4e0d\u5728\u5317\u4eac\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown<>&#8216;\u5317\u4eac&#8217;<\/p>\n<p>\t\u903b\u8f91\u8fd0\u7b97<\/p>\n<p>\t\t\u4f8b1\uff1a\u67e5\u8be2\u5e74\u9f84\u5c0f\u4e8e20\u7684\u5973\u540c\u5b66<\/p>\n<p>\t\t\tselect * from students where age<20 and sex='\u5973'\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u5b66\u751f\u6216'1\u73ed'\u7684\u5b66\u751f\n\n\t\t\tselect * from students where sex='\u5973' or class='1\u73ed'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u975e\u5929\u6d25\u7684\u5b66\u751f\n\n\t\t\tselect * from students where not hometown='\u5929\u6d25'\n\n\t\u6a21\u7cca\u67e5\u8be2\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u59d3\u5b59\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59%'\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u59d3\u5b59\u4e14\u540d\u5b57\u662f\u4e00\u4e2a\u5b57\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59__'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u53eb\u4e54\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u4e54'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u59d3\u540d\u542b\u767d\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u767d%'\n\n\t\u8303\u56f4\u67e5\u8be2\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5bb6\u4e61\u662f\u5317\u4eac\u6216\u4e0a\u6d77\u6216\u5e7f\u4e1c\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown='\u5317\u4eac' or hometown='\u4e0a\u6d77' or hometown='\u5e7f\u4e1c'\n\n\t\t\tselect * from students where hometown in ('\u5317\u4eac','\u4e0a\u6d77','\u5e7f\u4e1c')\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5e74\u9f84\u4e3a18\u81f320\u7684\u5b66\u751f\n\n\t\t\tselect * from students where age in (18,19,20)\n\n\t\t\tselect * from students where age between 18 and 20   \u5c0f\u503c\u5728\u524d\uff0c\u5927\u503c\u5728\u540e\n\n\t\t\tselect * from students where age>=20 and age<=18\n\n\t\u7a7a\u5224\u65ad\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6ca1\u6709\u586b\u5199\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\n\t\t\tselect * from students where  card is null\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u586b\u5199\u4e86\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\t\t\n\t\t\tselect * from students where  card is not null\n\n\t\t'' \u4ee3\u8868\u63d2\u5165\u7684\u6570\u636e\u4e3a\u7a7a\u5b57\u7b26\u4e32\n\n\t\tinsert into students values('013','\u51ef','\u7537','\u5317\u4eac',20,'1\u73ed','')\n\n\t\tnull \u4ee3\u8868\u63d2\u5165\u7684\u503c\u4e3a\u7a7a\n\t\tinsert into students values('014','\u51ef2','\u7537','\u5317\u4eac',20,'1\u73ed',null)\n\n\t\t\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5982\u679c\u4e00\u4e9b\u5b57\u6bb5\u6ca1\u6307\u5b9a\u6570\u636e\uff0c\u9ed8\u8ba4\u4e3anull\n\t\tinsert into students(studentNo,name) values('015','\u51ef3')\n\n\t\u6392\u5e8f\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5927\u5230\u5c0f\u6392\u5e8f\uff0c\u5e74\u9f84\u76f8\u540c\u65f6\uff0c\u518d\u6309\u5b66\u53f7\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age desc,studentNo \n\n\t\t\u5bf9\u4e2d\u6587\u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\n\t\tselect * from students order by convert(name using gbk)\n\n\t\u805a\u5408\u51fd\u6570\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u603b\u6570\n\n\t\t\tcount(*)\u4ee3\u8868\u5982\u679c\u4e00\u884c\u8bb0\u5f55\u4e2d\u4efb\u4f55\u4e00\u4e2a\u5b57\u6bb5\u6709\u503c\uff0c\u5c31\u4f1a\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(*) from students\n\n\t\t\tcount(card)\u4ee3\u8868\u7edf\u8ba1\u67d0\u4e00\u4e2a\u5217\u7684\u4e2a\u6570\uff0c\u4e0d\u4f1a\u628anull\u503c\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(card) from students\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u751f\u7684\u6700\u5927\u5e74\u9f84\n\n\t\t\tselect max(age) from students where sex='\u5973'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be21\u73ed\u7684\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect min(age) from students where class='1\u73ed'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u5317\u4eac\u5b66\u751f\u7684\u5e74\u9f84\u603b\u548c\n\n\t\t\tselect sum(age) from students where hometown='\u5317\u4eac'\n\n\t\t\u4f8b5\uff1a\u67e5\u8be2\u5973\u751f\u7684\u5e73\u5747\u5e74\u9f84\n\n\t\t\tselect avg(age) from students where sex='\u5973'\n\n\n\t\u5206\u7ec4\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5404\u79cd\u6027\u522b\u7684\u4eba\u6570\n\n\t\t\tselect sex,count(*) from students group by sex\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5404\u79cd\u5e74\u9f84\u7684\u4eba\u6570\n\n\t\t\tselect age,count(*) from students group by age\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u7537\u751f\u603b\u4eba\u6570    having\u5fc5\u987b\u653e\u5728group by \u540e\u9762\n\n\t\t\tselect count(*) from students where sex='\u7537'\n\n\t\t\tselect sex,count(*) from students group by sex having sex='\u7537'\n\n\n\n\t\t\u67e5\u8be21\u73ed\u9664\u5916\u5176\u4ed6\u73ed\u7ea7\u5b66\u751f\u7684\u5e73\u5747\u5e74\u9f84\u3001\u6700\u5927\u5e74\u9f84\u3001\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect class,avg(age),max(age),min(age) from students where class!='1\u73ed' group by class\n\n\t\t\tselect class,avg(age),max(age),min(age) from students group by class having class!='1\u73ed'\n\n\n\t\t\u6309\u7167\u591a\u4e2a\u5b57\u6bb5\u5206\u7ec4\uff0c\u591a\u4e2a\u5b57\u6bb5\u503c\u4e00\u6a21\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u4e00\u7ec4\u7684\n\n\t\t\tselect class,sex,count(*) from students group by class,sex\n\n\t\u83b7\u53d6\u90e8\u5206\u884c\n\n\t\t\tlimit start,count  mysql\u4e2d\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\u7684\u4f4d\u7f6e\u662f0\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u524d3\u884c\u5b66\u751f\u4fe1\u606f  \n\n\t\t\tselect * from students limit 1,2\n\n\t\t\tlimit 2 \u5c31\u7b49\u4e8e limit 0,2\n\n\t\t\u5206\u9875\n\n\t\t\t\u6bcf\u9875\u663e\u793a4\u6761\n\n\n\t\t\t1\u9875\n\t\t\t\n\t\t\t\tselect * from students limit 0,4  (n-1)*4\n\n\t\t\t2\u9875\n\t\t\t\t\n\t\t\t\tselect * from students limit 4,4  \n\n\t\t\t3\u9875\n\n\t\t\t\tselect * from students limit 8,4\n\n\t\u8fde\u63a5\u67e5\u8be2\n\n\t\t\u7b49\u503c\u8fde\u63a5\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u6210\u7ee9\n\n\t\t\t\t\u751f\u6210\u4e34\u65f6\u8868\uff0c\u7136\u540e\u5728\u4e34\u65f6\u8868\u4e2d\u4f7f\u7528\u5173\u8054\u7684\u5b57\u6bb5\u8fdb\u884c\u8fc7\u6ee4\n\n\t\t\t\tselect stu.name,sc.score from students as stu,scores as sc\n\t\t\t\twhere stu.studentNo=sc.studentNo\n\n\t\t\t\t\u5185\u8fde\u63a5\uff0c\u4e0d\u751f\u6210\u4e34\u65f6\u8868\uff0c\u8fde\u63a5\u65f6\u5148\u5224\u65ad\u6761\u4ef6\uff0c\u53ea\u6709\u7b26\u5408\u6761\u4ef6\u624d\u4f1a\u8fde\u63a5\u518d\u653e\u5230\u7ed3\u679c\n\n\t\t\t\tselect * from students as stu\n\t\t\t\tinner join scores as sc on stu.studentNo=sc.studentNo\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u8bfe\u7a0b\u4fe1\u606f\u53ca\u8bfe\u7a0b\u7684\u6210\u7ee9\n\n\t\t\t\tselect * from scores,courses\n\t\t\t\twhere scores.courseNo=courses.courseNo\n\n\t\t\t\tselect * from courses\n\t\t\t\tinner join scores on scores.courseNo=courses.courseNo\n\n\n\t\t\t\u4f8b3\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u8bfe\u7a0b\u5bf9\u5e94\u7684\u6210\u7ee9\n\n\n\t\t\t\tselect\n\t\t\t\t\t*\n\t\t\t\tfrom\n\t\t\t\t\tstudents,\n\t\t\t\t\tscores,\n\t\t\t\t\tcourses\n\t\t\t\twhere\n\t\t\t\tstudents.studentno = scores.studentno\n\t\t\t\tand scores.courseno = courses.courseno \n\n\t\t\t\tselect\n\t\t\t\t\tstudents. name,\n\t\t\t\t\tcourses. name as coursename,\n\t\t\t\t\tscores.score\n\t\t\t\tfrom\n\t\t\t\t\tstudents\n\t\t\t\tinner join scores on students.studentno = scores.studentno\n\t\t\t\tinner join courses on scores.courseno = courses.courseno\n\n\n\u67e5\u8be2\u7ec3\u4e60\u9898\n1\u3001\u67e5\u8be2\u5b66\u751f\"\u767e\u91cc\u5b88\u7ea6\"\u7684\u57fa\u672c\u4fe1\u606f\n\n2\u3001\u67e5\u8be2\u5b66\u751f\"\u767e\u91cc\u5b88\u7ea6\"\u6216\u201d\u767e\u91cc\u7384\u7b56\u201d\u7684\u57fa\u672c\u4fe1\u606f\n\n3\u3001\u67e5\u8be2\u59d3\"\u5f20\"\u5b66\u751f\u7684\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u73ed\u7ea7\n\n4\u3001\u67e5\u8be2\u59d3\u540d\u4e2d\u542b\u6709\"\u7ea6\"\u5b57\u7684\u5b66\u751f\u7684\u57fa\u672c\u4fe1\u606f\n\n5\u3001\u67e5\u8be2\u59d3\u540d\u957f\u5ea6\u4e3a\u4e09\u4e2a\u5b57\uff0c\u59d3\u201c\u5b59\u201d\u7684\u5b66\u751f\u7684\u5b66\u53f7\uff0c\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u73ed\u7ea7\uff0c\u8eab\u4efd\u8bc1\u53f7\n\n6\u3001\u67e5\u8be2\u59d3\"\u767e\"\u6216\u8005\u59d3\u201d\u5b59\u201d\u7684\u5b66\u751f\u7684\u57fa\u672c\u4fe1\u606f\n\n7\u3001\u67e5\u8be2\u59d3\"\u767e\"\u5e76\u4e14\u5bb6\u4e61\u662f\"\u5c71\u897f\"\u7684\u5b66\u751f\u4fe1\u606f\n\n8\u3001\u67e5\u8be2\u5bb6\u4e61\u662f\"\u5317\u4eac\"\u3001\u201d\u65b0\u7586\u201d\u3001\u201d\u5c71\u4e1c\u201d\u6216\u8005\"\u4e0a\u6d77\"\u7684\u5b66\u751f\u7684\u4fe1\u606f\n\n9\u3001\u67e5\u8be2\u59d3\"\u5b59\"\uff0c\u4f46\u662f\u5bb6\u4e61\u4e0d\u662f\"\u6cb3\u5317\"\u7684\u5b66\u751f\u4fe1\u606f\n\n10\u3001\u67e5\u8be2\u5bb6\u4e61\u4e0d\u662f\"\u5317\u4eac\"\u3001\"\u65b0\u7586\"\u3001\"\u5c71\u4e1c\"\u3001\"\u4e0a\u6d77\"\u7684\u5b66\u751f\u7684\u4fe1\u606f\n\n11\u3001\u67e5\u8be2\u5168\u90e8\u5b66\u751f\u4fe1\u606f\uff0c\u5e76\u6309\u7167\u201c\u6027\u522b\u201d\u6392\u5e8f\n\n12\u3001\u67e5\u8be2\u73b0\u6709\u5b66\u751f\u90fd\u6765\u81ea\u4e8e\u54ea\u4e9b\u4e0d\u540c\u7684\u7701\u4efd\n\n13\u3001\u67e5\u8be2\u6240\u6709\u7537\u751f\uff0c\u5e76\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f\n\n14\u3001\u7edf\u8ba1\u5171\u6709\u591a\u5c11\u4e2a\u5b66\u751f\n\n15\u3001\u7edf\u8ba1\u5e74\u9f84\u5927\u4e8e20\u5c81\u7684\u5b66\u751f\u6709\u591a\u5c11\u4e2a\n\n16\u3001\u7edf\u8ba1\u7537\u751f\u7684\u5e73\u5747\u5e74\u9f84\n\n17\u3001\u67e5\u8be21\u73ed\u5b66\u751f\u4e2d\u7684\u6700\u5927\u5e74\u9f84\u662f\u591a\u5c11\n\n18\u3001\u7edf\u8ba12\u73ed\u7537\u5973\u751f\u5404\u6709\u591a\u5c11\u4eba\n\n19\u3001\u7edf\u8ba1\u6bcf\u4e2a\u73ed\u7ea7\u4e2d\u6bcf\u79cd\u6027\u522b\u7684\u5b66\u751f\u4eba\u6570\uff0c\u5e76\u6309\u7167\u73ed\u7ea7\u5347\u5e8f\u6392\u5e8f\n\n20\u3001\u67e5\u8be2\u5e74\u9f84\u6700\u5c0f\u7684\u5b66\u751f\u7684\u5168\u90e8\u4fe1\u606f\n4\u5929\n\n\t\u6570\u636e\u5e93\u6982\u5ff5\n\n\tmysql navicat\n\n\tsql\u8bed\u53e5 \u67e5\u8be2\n\n\tmysql\u9ad8\u7ea7\n\n1\u3001\u6982\u5ff5\n\n\t1.1\u3001\u6570\u636e\u5e93\u7684\u4f5c\u7528\n\n\t\t\u7528\u6765\u5b58\u50a8\u6570\u636e\uff0c\u65b9\u4fbf\u67e5\u8be2\n\n\t1.2\u3001\u5173\u7cfb\u578b\u6570\u636e\u5e93\n\n\t\t\u6838\u5fc3\u662f\u7528\u4e8c\u7ef4\u8868\u5b58\u50a8\u6570\u636e\n\n\t\t\u884c\uff0c\u8bb0\u5f55\uff0c\u4ee3\u8868\u7684\u662f\u4e00\u6761\u4e8b\u7269\u7684\u4fe1\u606f\n\t\t\u5217\uff0c\u5b57\u6bb5\uff0c\u4ee3\u8868\u4e00\u6761\u4e8b\u7269\u7684\u67d0\u4e00\u4e2a\u5c5e\u6027\n\n\t\t\u8868\u53ef\u4ee5\u5b58\u5f88\u591a\u884c\n\t\t\u6570\u636e\u5e93\u53ef\u4ee5\u5b58\u5f88\u591a\u8868\n\n\t1.3\u3001SQL\n\n\t\t\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93\n\n\t\t\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0cselect Select\n\n\t1.4\u3001MySQL\n\t\t\n\t\t\u745e\u5178\u516c\u53f8\u5f00\u53d1\uff0c\u88ab\u5356\u7ed9Sun\uff0cSun\u53c8\u88ab\u5356\u7ed9Oracle\n\n\t\t\u5f00\u6e90 \u514d\u8d39 \u652f\u6301\u591a\u5e73\u53f0\n\n2\u3001MySQL\u5b89\u88c5\n\n\t\u670d\u52a1\u7aef\uff1a\u4e0d\u80fd\u5e26\u4e2d\u6587\u8def\u5f84\n\n\t\t\u542f\u52a8  \u505c\u6b62  \u91cd\u542f\n\n\n\t\u5ba2\u6237\u7aef\uff1a\n\n\t\t\u547d\u4ee4\u884c\u5ba2\u6237\u7aef\n\n\t\tnavicat\n\n3\u3001navicat\u4f7f\u7528\n\n\t\u8fde\u63a5\u670d\u52a1\u7aef\n\n\t\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801\n\n\t\u6570\u636e\u5e93\u64cd\u4f5c \n\n\t\t\u521b\u5efa  \u5b57\u7b26\u96c6\u7528\u8fc7utf8\n\n\t\t\u7f16\u8f91  \u4e0d\u80fd\u6539\u540d\u79f0\n\n\t\t\u5220\u9664\n\n\n\t\u6570\u636e\u8868\n\n\t\t\u521b\u5efa\n\n\t\t\u8bbe\u8ba1\u8868 \n\n\t\t\t\u6dfb\u52a0\u5b57\u6bb5\n\n\t\t\t\u4fee\u6539\u5b57\u6bb5\n\n\t\t\t\u5220\u9664\u5b57\u6bb5\n\n\t\t\u91cd\u547d\u540d\n\n\t\t\u5220\u9664\n\n\t\u6570\u636e\u64cd\u4f5c\n\n\t\t\u6dfb\u52a0 \n\n\t\t\u5220\u9664\n\n\t\t\u4fee\u6539\n\n\t\t\u67e5\u8be2\n\n4\u3001\u6570\u636e\u7c7b\u578b\u4e0e\u7ea6\u675f\n\n\tint \uff1a \u6709\u7b26\u53f7\u8303\u56f4\uff08-2147483648 ~2147483647\uff09\uff0c\u65e0\u7b26\u53f7\u8303\u56f4\uff080 ~ 4294967295\uff09\uff0c\u957f\u5ea6\u6ca1\u6709\u610f\u4e49\n\n\tvarchar \uff1avarchar(3)\u8868\u793a\u6700\u591a\u5b583\u4e2a\u5b57\u7b26\uff0c\u4e00\u4e2a\u4e2d\u6587\u6216\u4e00\u4e2a\u5b57\u6bcd\u90fd\u5360\u4e00\u4e2a\u5b57\u7b26\n\n\tdecimal \uff1adecimal(5,2)\u8868\u793a\u5171\u5b585\u4f4d\u6570\uff0c\u5c0f\u6570\u53602\u4f4d\uff0c\u6574\u6570\u53603\u4f4d\n\n\n\t\u4e3b\u952e\uff1a\u5b57\u6bb5\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4e14\u4e0d\u80fd\u4e3anull\uff0c\u552f\u4e00\u6807\u8bc6\u67d0\u4e00\u6761\u6570\u636e\uff0c\u4e00\u822c\u5b57\u6bb5\u540d\u53ebid\uff0cint\u7c7b\u578b\u3001\u65e0\u7b26\u53f7\u3001\u81ea\u52a8\u9012\u589e\n\n\n5\u3001sql\u8bed\u8a00\n\n\t\u8868\n\n\t\t\u521b\u5efa\u8868\n\n\t\t\tcreate table \u8868\u540d(\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f,\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f\n\t\t\t...\n\t\t\t)\n\n\t\t\t-- \u6ce8\u91ca ctrl + \/\n\t\t\t-- \u53d6\u6d88\u6ce8\u91ca ctrl + shift + \/\n\n\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a\n\t\t\t\n\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\n\n\t\t\t\tcreate table students(\n\t\t\t\tname varchar(10)\n\t\t\t\t)\n\n\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a\n\t\t\t\n\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84\n\n\t\t\t\tcreate table students2(\n\t\t\t\tname varchar(10),\n\t\t\t\tage int unsigned\n\t\t\t\t)\n\n\n\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a\n\t\t\t\n\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84\uff0c\u8eab\u9ad8(\u4fdd\u7559\u5c0f\u6570\u70b92\u4f4d)\n\t\t\t\n\t\t\t\tcreate table students3(\n\t\t\t\tid int unsigned primary key auto_increment,\n\t\t\t\tname varchar(10),\n\t\t\t\tage int unsigned,\n\t\t\t\theight decimal(5,2)\n\t\t\t\t)\n\n\t\t\u5220\u9664\u8868\n\n\t\t\t\u5982\u679c\u8868\u4e0d\u5b58\u5728\uff0c\u4f1a\u62a5\u9519\n\t\t\tdrop table students\n\n\t\t\t\u5982\u679c\u8868\u5b58\u5728\uff0c\u624d\u5220\u9664\uff0c\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u62a5\u9519\n\t\t\tdrop table if exists students3;\n\n\t\t\tcreate table students3(\n\t\t\tid int unsigned primary key auto_increment,\n\t\t\tname varchar(10),\n\t\t\tage int unsigned,\n\t\t\theight decimal(5,2)\n\t\t\t)\n\n\t\u6570\u636e\u64cd\u4f5c\n\n\t\t\u63d2\u5165\u6570\u636e\n\n\t\t\tinsert into \u8868\u540d values(...)\n\t\t\t\u4f8b\uff1a\u63d2\u5165\u4e00\u4e2a\u5b66\u751f\uff0c\u8bbe\u7f6e\u6240\u6709\u5b57\u6bb5\u7684\u4fe1\u606f\n\n\t\t\t\tinsert into students3 values(0,'\u4e9a\u745f',16,160.5)\n\t\t\t\tinsert into students3 values(default,'\u4e9a\u745f2',16,160.5)\n\t\t\t\tinsert into students3 values(null,'\u4e9a\u745f',16,160.5)\n\n\t\t\t\u7ed9\u90e8\u5206\u5b57\u6bb5\u8bbe\u7f6e\u6570\u636e\n\t\t\t\t\n\t\t\t\tinsert into students3(name) values('\u9c81\u73ed')\n\n\t\t\t\tinsert into students3(name,age) values('\u9c81\u73ed2',30) \n\n\t\t\t\u6267\u884c\u591a\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e\n\n\t\t\t\tinsert into students3 values(null,'\u4e9a\u745f4',16,160.5);\n\t\t\t\tinsert into students3 values(null,'\u4e9a\u745f5',16,160.5);\n\t\t\t\tinsert into students3 values(null,'\u4e9a\u745f6',16,160.5)\n\n\t\t\t\u6267\u884c\u4e00\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e\n\t\t\t\t\n\t\t\t\tinsert into students3(name) values('\u9c81\u73ed'),('\u9c81\u73ed2'),('\u9c81\u73ed3'),('\u9c81\u73ed4')\n\n\t\t\u66f4\u65b0\u6570\u636e\n\n\t\t\t\u683c\u5f0f\uff1aupdate \u8868\u540d set \u52171=\u503c1,\u52172=\u503c2... where \u6761\u4ef6\n\t\t\t\u4f8b\uff1a\u4fee\u6539id\u4e3a5\u7684\u5b66\u751f\u6570\u636e\uff0c\u59d3\u540d\u6539\u4e3a \u72c4\u4ec1\u6770\uff0c\u5e74\u9f84\u6539\u4e3a 20\n\n\t\t\t\tupdate students3 set age=10 where id=5\n\n\t\t\t\tupdate students3 set name='\u72c4\u4ec1\u6770',age=22,height=123.246 where age=20\n\n\t\t\u5220\u9664\u6570\u636e\n\n\t\t\t\u683c\u5f0f\uff1adelete from \u8868\u540d where \u6761\u4ef6\n\t\t\t\u4f8b\uff1a\u5220\u9664id\u4e3a6\u7684\u5b66\u751f\u6570\u636e\n\n\t\t\tdelete from hero2 \n\n\t\t\tdelete from students3 where id=12\n\n\t\t\u903b\u8f91\u5220\u9664\n\n\t\t\t1\u3001\u7ed9\u8868\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u540d\u5b57\u53ebisdelete int\u7c7b\u578b \uff0c0\u4ee3\u8868\u672a\u5220\u9664\uff0c1\u4ee3\u8868\u5220\u9664\n\n\t\t\t2\u3001\u628a\u8868\u4e2d\u6240\u6709\u7684\u6570\u636eisdelete\u5b57\u6bb5\u6539\u4e3a0\n\n\t\t\t3\u3001\u60f3\u5220\u9664\u6570\u636e\u65f6\uff0c\u4f7f\u7528update\u8bed\u53e5\uff0c\u628a\u67d0\u6761\u6570\u636e\u7684isdelete\u5b57\u6bb5\u6539\u4e3a1\n\n\t\t\t\tupdate students3 set isdelete=1 where id=5\n\n\t\t\t4\u3001\u5728\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u53ea\u67e5\u8be2isdelete\u4e3a0\u7684\u6570\u636e\n\n\t\t\t\tselect * from students3 where isdelete=0\n\n\t\u67e5\u8be2\n\n\t\t\u67e5\u8be2\u6240\u6709\u5b57\u6bb5\n\n\t\t\tselect * from \u8868\u540d\n\n\t\t\tselect * from students\n\n\t\t\u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5\n\n\t\t\tselect name,hometown from students\n\n\t\t\u7ed9\u5b57\u6bb5\u53d6\u522b\u540d\n\n\t\t\tselect name as \u59d3\u540d,hometown as \u5bb6\u4e61 from students\n\t\t\n\t\t\u7ed9\u8868\u53d6\u522b\u540d\n\n\t\t\tselect stu.name,stu.hometown from students as stu\n\n\t\t\u53bb\u91cd\uff0c\u91cd\u590d\u7684\u8bb0\u5f55\u53ea\u663e\u793a\u4e00\u6761\uff0c\u5f53\u663e\u793a\u7684\u4e00\u6574\u884c\u8bb0\u5f55\u8ddf\u53e6\u4e00\u6574\u884c\u8bb0\u5f55\u5b8c\u5168\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u91cd\u590d\u7684\u8bb0\u5f55\n\n\t\t\tselect distinct sex from students\n\n\t\t\tselect distinct sex,class  from students\n\n\n\t\u6bd4\u8f83\u8fd0\u7b97\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5c0f\u4e54\u7684\u5e74\u9f84\n\n\t\t\tselect age from students where name='\u5c0f\u4e54'\n\n\t\t\u4f8b2\uff1a\u67e5\u8be220\u5c81\u4ee5\u4e0b\u7684\u5b66\u751f\n\n\t\t\tselect * from students where age<=20\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u5bb6\u4e61\u4e0d\u5728\u5317\u4eac\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown<>&#8216;\u5317\u4eac&#8217;<\/p>\n<p>\t\u903b\u8f91\u8fd0\u7b97<\/p>\n<p>\t\t\u4f8b1\uff1a\u67e5\u8be2\u5e74\u9f84\u5c0f\u4e8e20\u7684\u5973\u540c\u5b66<\/p>\n<p>\t\t\tselect * from students where age<20 and sex='\u5973'\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u5b66\u751f\u6216'1\u73ed'\u7684\u5b66\u751f\n\n\t\t\tselect * from students where sex='\u5973' or class='1\u73ed'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u975e\u5929\u6d25\u7684\u5b66\u751f\n\n\t\t\tselect * from students where not hometown='\u5929\u6d25'\n\n\t\u6a21\u7cca\u67e5\u8be2\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u59d3\u5b59\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59%'\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u59d3\u5b59\u4e14\u540d\u5b57\u662f\u4e00\u4e2a\u5b57\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59__'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u53eb\u4e54\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u4e54'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u59d3\u540d\u542b\u767d\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u767d%'\n\n\t\u8303\u56f4\u67e5\u8be2\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5bb6\u4e61\u662f\u5317\u4eac\u6216\u4e0a\u6d77\u6216\u5e7f\u4e1c\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown='\u5317\u4eac' or hometown='\u4e0a\u6d77' or hometown='\u5e7f\u4e1c'\n\n\t\t\tselect * from students where hometown in ('\u5317\u4eac','\u4e0a\u6d77','\u5e7f\u4e1c')\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5e74\u9f84\u4e3a18\u81f320\u7684\u5b66\u751f\n\n\t\t\tselect * from students where age in (18,19,20)\n\n\t\t\tselect * from students where age between 18 and 20   \u5c0f\u503c\u5728\u524d\uff0c\u5927\u503c\u5728\u540e\n\n\t\t\tselect * from students where age>=20 and age<=18\n\n\t\u7a7a\u5224\u65ad\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6ca1\u6709\u586b\u5199\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\n\t\t\tselect * from students where  card is null\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u586b\u5199\u4e86\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\t\t\n\t\t\tselect * from students where  card is not null\n\n\t\t'' \u4ee3\u8868\u63d2\u5165\u7684\u6570\u636e\u4e3a\u7a7a\u5b57\u7b26\u4e32\n\n\t\tinsert into students values('013','\u51ef','\u7537','\u5317\u4eac',20,'1\u73ed','')\n\n\t\tnull \u4ee3\u8868\u63d2\u5165\u7684\u503c\u4e3a\u7a7a\n\t\tinsert into students values('014','\u51ef2','\u7537','\u5317\u4eac',20,'1\u73ed',null)\n\n\t\t\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5982\u679c\u4e00\u4e9b\u5b57\u6bb5\u6ca1\u6307\u5b9a\u6570\u636e\uff0c\u9ed8\u8ba4\u4e3anull\n\t\tinsert into students(studentNo,name) values('015','\u51ef3')\n\n\t\u6392\u5e8f\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5927\u5230\u5c0f\u6392\u5e8f\uff0c\u5e74\u9f84\u76f8\u540c\u65f6\uff0c\u518d\u6309\u5b66\u53f7\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age desc,studentNo \n\n\t\t\u5bf9\u4e2d\u6587\u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\n\t\tselect * from students order by convert(name using gbk)\n\n\t\u805a\u5408\u51fd\u6570\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u603b\u6570\n\n\t\t\tcount(*)\u4ee3\u8868\u5982\u679c\u4e00\u884c\u8bb0\u5f55\u4e2d\u4efb\u4f55\u4e00\u4e2a\u5b57\u6bb5\u6709\u503c\uff0c\u5c31\u4f1a\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(*) from students\n\n\t\t\tcount(card)\u4ee3\u8868\u7edf\u8ba1\u67d0\u4e00\u4e2a\u5217\u7684\u4e2a\u6570\uff0c\u4e0d\u4f1a\u628anull\u503c\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(card) from students\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u751f\u7684\u6700\u5927\u5e74\u9f84\n\n\t\t\tselect max(age) from students where sex='\u5973'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be21\u73ed\u7684\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect min(age) from students where class='1\u73ed'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u5317\u4eac\u5b66\u751f\u7684\u5e74\u9f84\u603b\u548c\n\n\t\t\tselect sum(age) from students where hometown='\u5317\u4eac'\n\n\t\t\u4f8b5\uff1a\u67e5\u8be2\u5973\u751f\u7684\u5e73\u5747\u5e74\u9f84\n\n\t\t\tselect avg(age) from students where sex='\u5973'\n\n\n\t\u5206\u7ec4\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5404\u79cd\u6027\u522b\u7684\u4eba\u6570\n\n\t\t\tselect sex,count(*) from students group by sex\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5404\u79cd\u5e74\u9f84\u7684\u4eba\u6570\n\n\t\t\tselect age,count(*) from students group by age\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u7537\u751f\u603b\u4eba\u6570    having\u5fc5\u987b\u653e\u5728group by \u540e\u9762\n\n\t\t\tselect count(*) from students where sex='\u7537'\n\n\t\t\tselect sex,count(*) from students group by sex having sex='\u7537'\n\n\n\n\t\t\u67e5\u8be21\u73ed\u9664\u5916\u5176\u4ed6\u73ed\u7ea7\u5b66\u751f\u7684\u5e73\u5747\u5e74\u9f84\u3001\u6700\u5927\u5e74\u9f84\u3001\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect class,avg(age),max(age),min(age) from students where class!='1\u73ed' group by class\n\n\t\t\tselect class,avg(age),max(age),min(age) from students group by class having class!='1\u73ed'\n\n\n\t\t\u6309\u7167\u591a\u4e2a\u5b57\u6bb5\u5206\u7ec4\uff0c\u591a\u4e2a\u5b57\u6bb5\u503c\u4e00\u6a21\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u4e00\u7ec4\u7684\n\n\t\t\tselect class,sex,count(*) from students group by class,sex\n\n\t\u83b7\u53d6\u90e8\u5206\u884c\n\n\t\t\tlimit start,count  mysql\u4e2d\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\u7684\u4f4d\u7f6e\u662f0\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u524d3\u884c\u5b66\u751f\u4fe1\u606f  \n\n\t\t\tselect * from students limit 1,2\n\n\t\t\tlimit 2 \u5c31\u7b49\u4e8e limit 0,2\n\n\t\t\u5206\u9875\n\n\t\t\t\u6bcf\u9875\u663e\u793a4\u6761\n\n\n\t\t\t1\u9875\n\t\t\t\n\t\t\t\tselect * from students limit 0,4  (n-1)*4\n\n\t\t\t2\u9875\n\t\t\t\t\n\t\t\t\tselect * from students limit 4,4  \n\n\t\t\t3\u9875\n\n\t\t\t\tselect * from students limit 8,4\n\n\t\u8fde\u63a5\u67e5\u8be2\n\n\t\t\u7b49\u503c\u8fde\u63a5\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u6210\u7ee9\n\n\t\t\t\t\u751f\u6210\u4e34\u65f6\u8868\uff0c\u7136\u540e\u5728\u4e34\u65f6\u8868\u4e2d\u4f7f\u7528\u5173\u8054\u7684\u5b57\u6bb5\u8fdb\u884c\u8fc7\u6ee4\n\n\t\t\t\tselect stu.name,sc.score from students as stu,scores as sc\n\t\t\t\twhere stu.studentNo=sc.studentNo\n\n\t\t\t\t\u5185\u8fde\u63a5\uff0c\u4e0d\u751f\u6210\u4e34\u65f6\u8868\uff0c\u8fde\u63a5\u65f6\u5148\u5224\u65ad\u6761\u4ef6\uff0c\u53ea\u6709\u7b26\u5408\u6761\u4ef6\u624d\u4f1a\u8fde\u63a5\u518d\u653e\u5230\u7ed3\u679c\n\n\t\t\t\tselect * from students as stu\n\t\t\t\tinner join scores as sc on stu.studentNo=sc.studentNo\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u8bfe\u7a0b\u4fe1\u606f\u53ca\u8bfe\u7a0b\u7684\u6210\u7ee9\n\n\t\t\t\tselect * from scores,courses\n\t\t\t\twhere scores.courseNo=courses.courseNo\n\n\t\t\t\tselect * from courses\n\t\t\t\tinner join scores on scores.courseNo=courses.courseNo\n\n\n\t\t\t\u4f8b3\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u8bfe\u7a0b\u5bf9\u5e94\u7684\u6210\u7ee9\n\n\n\t\t\t\tselect\n\t\t\t\t\t*\n\t\t\t\tfrom\n\t\t\t\t\tstudents,\n\t\t\t\t\tscores,\n\t\t\t\t\tcourses\n\t\t\t\twhere\n\t\t\t\tstudents.studentno = scores.studentno\n\t\t\t\tand scores.courseno = courses.courseno \n\n\t\t\t\tselect\n\t\t\t\t\tstudents. name,\n\t\t\t\t\tcourses. name as coursename,\n\t\t\t\t\tscores.score\n\t\t\t\tfrom\n\t\t\t\t\tstudents\n\t\t\t\tinner join scores on students.studentno = scores.studentno\n\t\t\t\tinner join courses on scores.courseno = courses.courseno\n\n\t\t\t\u4f8b7\uff1a\u67e5\u8be2\u7537\u751f\u4e2d\u6700\u9ad8\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u59d3\u540d\u3001\u8bfe\u7a0b\u540d\u3001\u6210\u7ee9\n\n\t\t\t\tselect \n\t\t\t\t\tstudents.sex,students.name,scores.score,courses.name as cName \n\t\t\t\tfrom \n\t\t\t\t\tcourses\n\t\t\t\tinner join scores on courses.courseNo=scores.courseNo\n\t\t\t\tinner join students on students.studentNo=scores.studentno\n\t\t\t\twhere students.sex='\u7537'\n\t\t\t\torder by scores.score desc\n\t\t\t\tlimit 1\n\n\n\t\t\u5de6\u8fde\u63a5\n\n\n\t\t\t\u67e5\u8be2\u6240\u6709\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u5b66\u751f\n\t\t\t\t\n\t\t\t\tjoin \u524d\u9762\u7684\u8868\u4e3a\u5de6\u8868\uff0cjoin \u540e\u9762\u7684\u8868\u4e3a\u53f3\u8868\n\t\t\t\t\n\t\t\t\tselect * from students\n\t\t\t\tleft join scores on students.studentNo=scores.studentno\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u5b66\u751f\uff0c\u9700\u8981\u663e\u793a\u8bfe\u7a0b\u540d\n\t\t\t\t\n\t\t\t\tselect * from students\n\t\t\t\tleft join scores on students.studentNo=scores.studentno\n\t\t\t\tleft join courses on courses.courseNo=scores.courseNo\n\n\t\t\u53f3\u8fde\u63a5\n\n\t\t\tinsert into courses values \n\t\t\t(0, '\u8bed\u6587'),\n\t\t\t(0, '\u6570\u5b66');\n\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u6240\u6709\u8bfe\u7a0b\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u8bfe\u7a0b\n\t\t\t\t\n\t\t\t\tselect * from scores\n\t\t\t\tright join courses on scores.courseNo=courses.courseNo\n\t\t\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u8bfe\u7a0b\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u8bfe\u7a0b,\u5305\u62ec\u5b66\u751f\u4fe1\u606f\n\n\t\t\t\tselect * from scores\n\t\t\t\tright join courses on scores.courseNo=courses.courseNo\n\t\t\t\tleft join students on students.studentNo=scores.studentNo\n\n\t\t\t\tselect students.*,scores.*,courses.* from courses\n\t\t\t\tleft join scores on scores.courseNo=courses.courseNo\n\t\t\t\tleft join students on students.studentNo=scores.studentno\n\n\t\t\u81ea\u5173\u8054\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u4e00\u5171\u6709\u591a\u5c11\u4e2a\u7701\n\n\t\t\t\tselect count(*) from areas where pid is null\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u6cb3\u5357\u7701\u7684\u6240\u6709\u57ce\u5e02\n\n\n\t\t\t\tfrom\u540e\u9762\u8ddf\u7684\u662f\u6570\u636e\u6e90\uff0c\u53ef\u4ee5\u5bf9\u4e00\u4e2a\u6570\u636e\u6e90\u67e5\u8be2\u591a\u6b21\n\n\t\t\t\tselect * from areas as sheng,areas as shi\n\t\t\t\twhere sheng.aid=shi.pid and sheng.atitle='\u6cb3\u5357\u7701'\n\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u90d1\u5dde\u5e02\u7684\u6240\u6709\u533a\u53bf\n\n\t\t\t\tselect * from areas as shi,areas as qu\n\t\t\t\twhere shi.aid=qu.pid and shi.atitle='\u90d1\u5dde\u5e02'\n\n\t\t\t\u4f8b3\uff1a\u67e5\u8be2\u6cb3\u5357\u7701\u7684\u6240\u6709\u533a\u53bf\n\t\t\t\t\n\t\t\t\tselect * from areas as sheng,areas as shi,areas as qu\n\t\t\t\twhere sheng.aid=shi.pid and qu.pid=shi.aid and sheng.atitle='\u6cb3\u5357\u7701'\n\n\t\t\t\t\u5148\u8fde\u63a5\u7701\u548c\u5e02\uff0c\u518d\u8fde\u63a5\u533a\n\t\t\t\tselect * from areas as sheng\n\t\t\t\tinner join areas as shi on sheng.aid=shi.pid\n\t\t\t\tinner join areas as qu on shi.aid=qu.pid\n\n\t\t\t\t\u5148\u8fde\u63a5\u5e02\u548c\u533a\uff0c\u518d\u8fde\u63a5\u7701\n\t\t\t\tselect * from areas as shi\n\t\t\t\tinner join areas as qu on shi.aid=qu.pid\n\t\t\t\tinner join areas as sheng on shi.pid=sheng.aid\n\n\t\t\t\t\u67e5\u8be2\u6cb3\u5357\u7701\u6240\u6709\u7684\u5e02\u548c\u533a\n\t\t\t\tselect * from areas as sheng\n\t\t\t\tinner join areas as shi on sheng.aid=shi.pid\n\t\t\t\tleft join areas as qu on shi.aid=qu.pid \n\t\t\t\twhere sheng.atitle='\u6cb3\u5357\u7701'\n\n\t\t\u5b50\u67e5\u8be2\n\n\t\t\u6807\u91cf\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u884c\u4e00\u5217\n\t\t\t\u67e5\u8be2\u5927\u4e8e\u5e73\u5747\u5e74\u9f84\u7684\u5b66\u751f\n\n\t\t\t\tselect avg(age) from students\n\n\t\t\t\t-- 21.5833\n\n\t\t\t\tselect * from students where age>21.5833<\/p>\n<p>\t\t\t\tselect * from students where age>(select avg(age) from students)<\/p>\n<p>\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u738b\u662d\u541b\u7684\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect studentNo from students where name=&#8217;\u738b\u662d\u541b&#8217;<\/p>\n<p>\t\t\t\tselect score from scores where studentNo=(select studentNo from students where name=&#8217;\u738b\u662d\u541b&#8217;)<\/p>\n<p>\t\t\u5217\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u5217\u591a\u884c<br \/>\n\t\t\t\u4f8b3\uff1a\u67e5\u8be218\u5c81\u7684\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect studentNo from students where age=18<\/p>\n<p>\t\t\t\tselect * from scores where studentNo in(select studentNo from students where age=18)<\/p>\n<p>\t\t\u884c\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u884c\u591a\u5217<br \/>\n\t\t\t\u4f8b4\uff1a\u67e5\u8be2\u7537\u751f\u4e2d\u5e74\u9f84\u6700\u5927\u7684\u5b66\u751f\u4fe1\u606f<\/p>\n<p>\t\t\t\tselect * from students where sex=&#8217;\u7537&#8217; and age=(select max(age) from students where sex=&#8217;\u7537&#8217;)<\/p>\n<p>\t\t\t\tselect * from students where sex=&#8217;\u7537&#8217; and age=30<\/p>\n<p>\t\t\t\tselect * from students where (sex,age)=(&#8216;\u7537&#8217;,30)<\/p>\n<p>\t\t\t\tselect * from students<br \/>\n\t\t\t\twhere (sex,age)=(select sex,age from students where sex=&#8217;\u7537&#8217; order by age desc limit 1)<\/p>\n<p>\t\t\u8868\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u7ed9\u53e6\u4e00\u4e2a\u67e5\u8be2\u5f53\u4f5c\u8868\u6765\u4f7f\u7528<\/p>\n<p>\t\t\t\u4f8b5\uff1a\u67e5\u8be2\u6570\u636e\u5e93\u548c\u7cfb\u7edf\u6d4b\u8bd5\u7684\u8bfe\u7a0b\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect * from scores<br \/>\n\t\t\t\tinner join courses on scores.courseNo=courses.courseNo<br \/>\n\t\t\t\twhere courses.name in (&#8216;\u6570\u636e\u5e93&#8217;,&#8217;\u7cfb\u7edf\u6d4b\u8bd5&#8217;)<\/p>\n<p>\t\t\t\tselect * from scores<br \/>\n\t\t\t\tinner join<br \/>\n\t\t\t\t(select * from courses where name in  (&#8216;\u6570\u636e\u5e93&#8217;,&#8217;\u7cfb\u7edf\u6d4b\u8bd5&#8217;)) as c<br \/>\n\t\t\t\ton scores.courseNo=c.courseNo<\/p>\n<p>\t\u67e5\u8be2\u6f14\u7ec3<\/p>\n<p>\t\t\u6c42\u6240\u6709\u7535\u8111\u4ea7\u54c1\u7684\u5e73\u5747\u4ef7\u683c,\u5e76\u4e14\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570<\/p>\n<p>\t\t\tselect round(avg(price),2) from goods<\/p>\n<p>\t\t\u67e5\u8be2\u6240\u6709\u4ef7\u683c\u5927\u4e8e\u5e73\u5747\u4ef7\u683c\u7684\u5546\u54c1\uff0c\u5e76\u4e14\u6309\u4ef7\u683c\u964d\u5e8f\u6392\u5e8f<\/p>\n<p>\t\t\tselect * from goods where price>(select round(avg(price),2) from goods) order by price desc<\/p>\n<p>\t\t\u67e5\u8be2\u7c7b\u578b\u4e3a&#8217;\u8d85\u6781\u672c&#8217;\u7684\u5546\u54c1\u4ef7\u683c<\/p>\n<p>\t\t\tselect price from goods where cate=&#8217;\u8d85\u7ea7\u672c&#8217;<\/p>\n<p>\t\t\u67e5\u8be2\u4ef7\u683c\u5927\u4e8e\u6216\u7b49\u4e8e&#8221;\u8d85\u7ea7\u672c&#8221;\u4ef7\u683c\u7684\u5546\u54c1\uff0c\u5e76\u4e14\u6309\u4ef7\u683c\u964d\u5e8f\u6392\u5217<\/p>\n<p>\t\t\tselect * from goods where price >=any(select price from goods where cate=&#8217;\u8d85\u7ea7\u672c&#8217;) order by price desc<\/p>\n<p>\t\t\u521b\u5efa\u7c7b\u578b\u8868<\/p>\n<p>\t\t\tcreate table goods_cates(<br \/>\n\t\t\tcate_id int unsigned primary key auto_increment,<br \/>\n\t\t\tcate_name varchar(10)<br \/>\n\t\t\t)<\/p>\n<p>\t\t\tselect distinct cate from goods<br \/>\n\t\t\tselect cate from goods group by cate<\/p>\n<p>\t\t\t\u63d2\u5165\u6570\u636e\uff0c\u67e5\u8be2\u51fa\u6765\u7684\u5b57\u6bb5\u9700\u8981\u548c\u60f3\u63d2\u5165\u7684\u5b57\u6bb5\u4fdd\u6301\u987a\u5e8f\u4e00\u81f4<br \/>\n\t\t\tinsert into goods_cates(cate_name) select distinct cate from goods<\/p>\n<p>\t\t\u521b\u5efa\u54c1\u724c\u8868,\u5e76\u4e14\u63d2\u5165\u6570\u636e\uff0c\u67e5\u8be2\u51fa\u6765\u7684\u5b57\u6bb5\u540d\u9700\u8981\u548c\u60f3\u63d2\u5165\u7684\u5b57\u6bb5\u540d\u4e00\u6a21\u4e00\u6837<\/p>\n<p>\t\t\tcreate table goods_brands(<br \/>\n\t\t\tbrand_id int unsigned primary key auto_increment,<br \/>\n\t\t\tbrand_name varchar(10)<br \/>\n\t\t\t)<br \/>\n\t\t\tselect distinct brand_name from goods<\/p>\n<p>\t\t\u66f4\u65b0\u5546\u54c1\u8868\u7684\u7c7b\u578b<\/p>\n<p>\t\t\tselect * from goods<br \/>\n\t\t\tinner join goods_cates on goods.cate=goods_cates.cate_name<\/p>\n<p>\t\t\tupdate goods<br \/>\n\t\t\tinner join goods_cates on goods.cate=goods_cates.cate_name<br \/>\n\t\t\tset goods.cate=goods_cates.cate_id<\/p>\n<p>\t\t\u66f4\u65b0\u5546\u54c1\u8868\u7684\u54c1\u724c<\/p>\n<p>\t\t\tupdate goods<br \/>\n\t\t\tinner join goods_brands on goods.brand_name=goods_brands.brand_name<br \/>\n\t\t\tset goods.brand_name=goods_brands.brand_id<\/p>\n<p>\t\t\u67e5\u8be2\u5546\u54c1\u4fe1\u606f\uff0c\u5305\u62ec\u54c1\u724c\u3001\u7c7b\u578b<\/p>\n<p>\t\t\tselect goods.id,goods.name,goods_cates.cate_name,goods_brands.brand_name from goods<br \/>\n\t\t\tinner join goods_cates on goods.cate_id=goods_cates.cate_id<br \/>\n\t\t\tinner join goods_brands on goods.brand_id=goods_brands.brand_id<\/p>\n<p>\u67e5\u8be2\u7ec3\u4e60\u9898<br \/>\n1\u3001\u67e5\u8be2\u5b66\u751f&#8221;\u767e\u91cc\u5b88\u7ea6&#8221;\u7684\u57fa\u672c\u4fe1\u606f<br \/>\nselect * from students where name=&#8217;\u767e\u91cc\u5b88\u7ea6&#8217;<\/p>\n<p>2\u3001\u67e5\u8be2\u5b66\u751f&#8221;\u767e\u91cc\u5b88\u7ea6&#8221;\u6216\u201d\u767e\u91cc\u7384\u7b56\u201d\u7684\u57fa\u672c\u4fe1\u606f<br \/>\nselect * from students where name=&#8217;\u767e\u91cc\u5b88\u7ea6&#8217; or name=&#8217;\u767e\u91cc\u7384\u7b56&#8217;<\/p>\n<p>3\u3001\u67e5\u8be2\u59d3&#8221;\u5f20&#8221;\u5b66\u751f\u7684\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u73ed\u7ea7<br \/>\nselect name,age,class from students where name like &#8216;\u5f20%&#8217;<\/p>\n<p>4\u3001\u67e5\u8be2\u59d3\u540d\u4e2d\u542b\u6709&#8221;\u7ea6&#8221;\u5b57\u7684\u5b66\u751f\u7684\u57fa\u672c\u4fe1\u606f<br \/>\nselect * from students where name like &#8216;%\u7ea6%&#8217;<\/p>\n<p>5\u3001\u67e5\u8be2\u59d3\u540d\u957f\u5ea6\u4e3a\u4e09\u4e2a\u5b57\uff0c\u59d3\u201c\u5b59\u201d\u7684\u5b66\u751f\u7684\u5b66\u53f7\uff0c\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u73ed\u7ea7\uff0c\u8eab\u4efd\u8bc1\u53f7<br \/>\nselect studentNo,name,age,class,card from students where name like &#8216;\u5b59__&#8217; <\/p>\n<p>6\u3001\u67e5\u8be2\u59d3&#8221;\u767e&#8221;\u6216\u8005\u59d3\u201d\u5b59\u201d\u7684\u5b66\u751f\u7684\u57fa\u672c\u4fe1\u606f<br \/>\nselect * from students where name like &#8216;\u767e%&#8217; or name like &#8216;\u5b59%&#8217;<\/p>\n<p>7\u3001\u67e5\u8be2\u59d3&#8221;\u767e&#8221;\u5e76\u4e14\u5bb6\u4e61\u662f&#8221;\u5c71\u897f&#8221;\u7684\u5b66\u751f\u4fe1\u606f<br \/>\nselect * from students where name like &#8216;\u767e%&#8217; and hometown=&#8217;\u5c71\u897f&#8217;<\/p>\n<p>8\u3001\u67e5\u8be2\u5bb6\u4e61\u662f&#8221;\u5317\u4eac&#8221;\u3001\u201d\u65b0\u7586\u201d\u3001\u201d\u5c71\u4e1c\u201d\u6216\u8005&#8221;\u4e0a\u6d77&#8221;\u7684\u5b66\u751f\u7684\u4fe1\u606f<br \/>\nselect * from students where hometown in(&#8216;\u5317\u4eac&#8217;,&#8217;\u65b0\u7586&#8217;,&#8217;\u5c71\u4e1c&#8217;,&#8217;\u4e0a\u6d77&#8217;)<\/p>\n<p>9\u3001\u67e5\u8be2\u59d3&#8221;\u5b59&#8221;\uff0c\u4f46\u662f\u5bb6\u4e61\u4e0d\u662f&#8221;\u6cb3\u5317&#8221;\u7684\u5b66\u751f\u4fe1\u606f<br \/>\nselect * from students where name like &#8216;\u5b59%&#8217; and hometown!=&#8217;\u6cb3\u5317&#8217;<\/p>\n<p>10\u3001\u67e5\u8be2\u5bb6\u4e61\u4e0d\u662f&#8221;\u5317\u4eac&#8221;\u3001&#8221;\u65b0\u7586&#8221;\u3001&#8221;\u5c71\u4e1c&#8221;\u3001&#8221;\u4e0a\u6d77&#8221;\u7684\u5b66\u751f\u7684\u4fe1\u606f<br \/>\nselect * from students where hometown not in(&#8216;\u5317\u4eac&#8217;,&#8217;\u65b0\u7586&#8217;,&#8217;\u5c71\u4e1c&#8217;,&#8217;\u4e0a\u6d77&#8217;)<\/p>\n<p>11\u3001\u67e5\u8be2\u5168\u90e8\u5b66\u751f\u4fe1\u606f\uff0c\u5e76\u6309\u7167\u201c\u6027\u522b\u201d\u6392\u5e8f<br \/>\nselect * from students order by sex<\/p>\n<p>12\u3001\u67e5\u8be2\u73b0\u6709\u5b66\u751f\u90fd\u6765\u81ea\u4e8e\u54ea\u4e9b\u4e0d\u540c\u7684\u7701\u4efd<br \/>\nselect hometown from students group by hometown<\/p>\n<p>13\u3001\u67e5\u8be2\u6240\u6709\u7537\u751f\uff0c\u5e76\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f<br \/>\nselect * from students where sex=&#8217;\u7537&#8217; order by age<\/p>\n<p>14\u3001\u7edf\u8ba1\u5171\u6709\u591a\u5c11\u4e2a\u5b66\u751f<br \/>\nselect count(*) from students<\/p>\n<p>15\u3001\u7edf\u8ba1\u5e74\u9f84\u5927\u4e8e20\u5c81\u7684\u5b66\u751f\u6709\u591a\u5c11\u4e2a<br \/>\nselect count(*) from students where age>20<\/p>\n<p>16\u3001\u7edf\u8ba1\u7537\u751f\u7684\u5e73\u5747\u5e74\u9f84<br \/>\nselect avg(age) from students where sex=&#8217;\u7537&#8217;<\/p>\n<p>17\u3001\u67e5\u8be21\u73ed\u5b66\u751f\u4e2d\u7684\u6700\u5927\u5e74\u9f84\u662f\u591a\u5c11<br \/>\nselect max(age) from students where class=&#8217;1\u73ed&#8217;<\/p>\n<p>18\u3001\u7edf\u8ba12\u73ed\u7537\u5973\u751f\u5404\u6709\u591a\u5c11\u4eba<br \/>\nselect class,sex,count(*) from students where class=&#8217;2\u73ed&#8217; group by sex<\/p>\n<p>19\u3001\u7edf\u8ba1\u6bcf\u4e2a\u73ed\u7ea7\u4e2d\u6bcf\u79cd\u6027\u522b\u7684\u5b66\u751f\u4eba\u6570\uff0c\u5e76\u6309\u7167\u73ed\u7ea7\u5347\u5e8f\u6392\u5e8f<br \/>\nselect class,sex,count(*) from students group by class,sex order by class<\/p>\n<p>20\u3001\u67e5\u8be2\u5e74\u9f84\u6700\u5c0f\u7684\u5b66\u751f\u7684\u5168\u90e8\u4fe1\u606f<br \/>\nselect * from students order by age limit 1<br \/>\n\u8868\u5173\u7cfb\u5982\u4e0b\uff1a<br \/>\n   &#8211; \u90e8\u95e8\u8868dept\uff1a\u90e8\u95e8\u6807\u53f7\uff08DEPTNO\uff09\uff0c\u90e8\u95e8\u540d\u79f0\uff08DNAME\uff09\uff0c\u6240\u5728\u4f4d\u7f6e\uff08LOC\uff09<br \/>\n   &#8211; \u96c7\u5458\u8868emp\uff1a\u5458\u5de5\u6807\u53f7\uff08Empno\uff09\uff0c\u5458\u5de5\u540d\u79f0\uff08Emname\uff09\uff0c\u5458\u5de5\u5de5\u4f4d\uff08Job\uff09\uff0c\u7ecf\u7406\uff08Mgr\uff09\uff0c\u96c7\u4f63\u65e5\u671f\uff08Hiredate\uff09\uff0c\u85aa\u6c34\uff08Sal\uff09\uff0c\u90e8\u95e8\u7f16\u53f7\uff08Deptno\uff09<\/p>\n<p>   \u5199\u51fasql\u8bed\u53e5\uff1a<br \/>\n   &#8211; \u627e\u51fa\u90e8\u95e8\u540d\u79f0\u4e3aACCOUNTING\u7684\u90e8\u95e8\u4e0b\u7684\u6240\u6709\u5458\u5de5\u540d\u79f0\uff1f<br \/>\n\tselect emname from emp where deptno=(select deptno from dept where dname=\u2018ACCOUNTING\u2019)<\/p>\n<p>   &#8211; \u627e\u51fa\u90e8\u95e8\u540d\u79f0\u4e3aSALES\u7684\u90e8\u95e8\u4e0b\u6bcf\u6708\u9700\u8981\u53d1\u51fa\u7684\u85aa\u6c34\u603b\u989d\uff1f<br \/>\n\tselect sum(sal) from emp where deptno=(select deptno from dept where dname=\u2018SALES\u2019)<\/p>\n<p>   &#8211; \u627e\u51fa\u90e8\u95e8\u540d\u79f0\u4e3aSALES\u7684\u90e8\u95e8\u7684\u90e8\u95e8\u7ecf\u7406\uff1f<\/p>\n<p>\tselect * from emp where deptno=(select deptno from dept where dname=\u2018SALES\u2019) <\/p>\n<p>\tselect jingli.emname from emp as jingli<br \/>\n\tinner join emp as yuangong on jingli.emname= yuangong.mgr<br \/>\n\twhere jingli.deptno=(select deptno from dept where dname=\u2018SALES\u2019)<\/p>\n<p>   &#8211; \u627e\u51fa\u90e8\u95e8\u540d\u79f0\u4e3aRESEARCH\u7684\u90e8\u95e8\u4e0b\u96c7\u4f63\u65e5\u671f\u4e3a1980-12-17\u7684\u5458\u5de5\uff1f<\/p>\n<p>\tselect * from emp where deptno=(select deptno from dept where dname=\u2018RESEARCH\u2019) and diredate=\u20181980-12-17\u2019<br \/>\n4\u5929<\/p>\n<p>\t\u6570\u636e\u5e93\u6982\u5ff5<\/p>\n<p>\tmysql navicat<\/p>\n<p>\tsql\u8bed\u53e5 \u67e5\u8be2<\/p>\n<p>\tmysql\u9ad8\u7ea7<\/p>\n<p>1\u3001\u6982\u5ff5<\/p>\n<p>\t1.1\u3001\u6570\u636e\u5e93\u7684\u4f5c\u7528<\/p>\n<p>\t\t\u7528\u6765\u5b58\u50a8\u6570\u636e\uff0c\u65b9\u4fbf\u67e5\u8be2<\/p>\n<p>\t1.2\u3001\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u6838\u5fc3\u662f\u7528\u4e8c\u7ef4\u8868\u5b58\u50a8\u6570\u636e<\/p>\n<p>\t\t\u884c\uff0c\u8bb0\u5f55\uff0c\u4ee3\u8868\u7684\u662f\u4e00\u6761\u4e8b\u7269\u7684\u4fe1\u606f<br \/>\n\t\t\u5217\uff0c\u5b57\u6bb5\uff0c\u4ee3\u8868\u4e00\u6761\u4e8b\u7269\u7684\u67d0\u4e00\u4e2a\u5c5e\u6027<\/p>\n<p>\t\t\u8868\u53ef\u4ee5\u5b58\u5f88\u591a\u884c<br \/>\n\t\t\u6570\u636e\u5e93\u53ef\u4ee5\u5b58\u5f88\u591a\u8868<\/p>\n<p>\t1.3\u3001SQL<\/p>\n<p>\t\t\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n<p>\t\t\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0cselect Select<\/p>\n<p>\t1.4\u3001MySQL<\/p>\n<p>\t\t\u745e\u5178\u516c\u53f8\u5f00\u53d1\uff0c\u88ab\u5356\u7ed9Sun\uff0cSun\u53c8\u88ab\u5356\u7ed9Oracle<\/p>\n<p>\t\t\u5f00\u6e90 \u514d\u8d39 \u652f\u6301\u591a\u5e73\u53f0<\/p>\n<p>2\u3001MySQL\u5b89\u88c5<\/p>\n<p>\t\u670d\u52a1\u7aef\uff1a\u4e0d\u80fd\u5e26\u4e2d\u6587\u8def\u5f84<\/p>\n<p>\t\t\u542f\u52a8  \u505c\u6b62  \u91cd\u542f<\/p>\n<p>\t\u5ba2\u6237\u7aef\uff1a<\/p>\n<p>\t\t\u547d\u4ee4\u884c\u5ba2\u6237\u7aef<\/p>\n<p>\t\tnavicat<\/p>\n<p>3\u3001navicat\u4f7f\u7528<\/p>\n<p>\t\u8fde\u63a5\u670d\u52a1\u7aef<\/p>\n<p>\t\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801<\/p>\n<p>\t\u6570\u636e\u5e93\u64cd\u4f5c <\/p>\n<p>\t\t\u521b\u5efa  \u5b57\u7b26\u96c6\u7528\u8fc7utf8<\/p>\n<p>\t\t\u7f16\u8f91  \u4e0d\u80fd\u6539\u540d\u79f0<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u8868<\/p>\n<p>\t\t\u521b\u5efa<\/p>\n<p>\t\t\u8bbe\u8ba1\u8868 <\/p>\n<p>\t\t\t\u6dfb\u52a0\u5b57\u6bb5<\/p>\n<p>\t\t\t\u4fee\u6539\u5b57\u6bb5<\/p>\n<p>\t\t\t\u5220\u9664\u5b57\u6bb5<\/p>\n<p>\t\t\u91cd\u547d\u540d<\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u6dfb\u52a0 <\/p>\n<p>\t\t\u5220\u9664<\/p>\n<p>\t\t\u4fee\u6539<\/p>\n<p>\t\t\u67e5\u8be2<\/p>\n<p>4\u3001\u6570\u636e\u7c7b\u578b\u4e0e\u7ea6\u675f<\/p>\n<p>\tint \uff1a \u6709\u7b26\u53f7\u8303\u56f4\uff08-2147483648 ~2147483647\uff09\uff0c\u65e0\u7b26\u53f7\u8303\u56f4\uff080 ~ 4294967295\uff09\uff0c\u957f\u5ea6\u6ca1\u6709\u610f\u4e49<\/p>\n<p>\tvarchar \uff1avarchar(3)\u8868\u793a\u6700\u591a\u5b583\u4e2a\u5b57\u7b26\uff0c\u4e00\u4e2a\u4e2d\u6587\u6216\u4e00\u4e2a\u5b57\u6bcd\u90fd\u5360\u4e00\u4e2a\u5b57\u7b26<\/p>\n<p>\tdecimal \uff1adecimal(5,2)\u8868\u793a\u5171\u5b585\u4f4d\u6570\uff0c\u5c0f\u6570\u53602\u4f4d\uff0c\u6574\u6570\u53603\u4f4d<\/p>\n<p>\t\u4e3b\u952e\uff1a\u5b57\u6bb5\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4e14\u4e0d\u80fd\u4e3anull\uff0c\u552f\u4e00\u6807\u8bc6\u67d0\u4e00\u6761\u6570\u636e\uff0c\u4e00\u822c\u5b57\u6bb5\u540d\u53ebid\uff0cint\u7c7b\u578b\u3001\u65e0\u7b26\u53f7\u3001\u81ea\u52a8\u9012\u589e<\/p>\n<p>5\u3001sql\u8bed\u8a00<\/p>\n<p>\t\u8868<\/p>\n<p>\t\t\u521b\u5efa\u8868<\/p>\n<p>\t\t\tcreate table \u8868\u540d(<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f,<br \/>\n\t\t\t\u5b57\u6bb5\u540d \u7c7b\u578b \u7ea6\u675f<br \/>\n\t\t\t&#8230;<br \/>\n\t\t\t)<\/p>\n<p>\t\t\t&#8212; \u6ce8\u91ca ctrl + \/<br \/>\n\t\t\t&#8212; \u53d6\u6d88\u6ce8\u91ca ctrl + shift + \/<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)<\/p>\n<p>\t\t\t\tcreate table students(<br \/>\n\t\t\t\tname varchar(10)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84<\/p>\n<p>\t\t\t\tcreate table students2(<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\t\u4f8b\uff1a\u521b\u5efa\u5b66\u751f\u8868\uff0c\u5b57\u6bb5\u8981\u6c42\u5982\u4e0b\uff1a<\/p>\n<p>\t\t\t\u59d3\u540d(\u957f\u5ea6\u4e3a10)\uff0c \u5e74\u9f84\uff0c\u8eab\u9ad8(\u4fdd\u7559\u5c0f\u6570\u70b92\u4f4d)<\/p>\n<p>\t\t\t\tcreate table students3(<br \/>\n\t\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\t\tname varchar(10),<br \/>\n\t\t\t\tage int unsigned,<br \/>\n\t\t\t\theight decimal(5,2)<br \/>\n\t\t\t\t)<\/p>\n<p>\t\t\u5220\u9664\u8868<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u4e0d\u5b58\u5728\uff0c\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table students<\/p>\n<p>\t\t\t\u5982\u679c\u8868\u5b58\u5728\uff0c\u624d\u5220\u9664\uff0c\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u62a5\u9519<br \/>\n\t\t\tdrop table if exists students3;<\/p>\n<p>\t\t\tcreate table students3(<br \/>\n\t\t\tid int unsigned primary key auto_increment,<br \/>\n\t\t\tname varchar(10),<br \/>\n\t\t\tage int unsigned,<br \/>\n\t\t\theight decimal(5,2)<br \/>\n\t\t\t)<\/p>\n<p>\t\u6570\u636e\u64cd\u4f5c<\/p>\n<p>\t\t\u63d2\u5165\u6570\u636e<\/p>\n<p>\t\t\tinsert into \u8868\u540d values(&#8230;)<br \/>\n\t\t\t\u4f8b\uff1a\u63d2\u5165\u4e00\u4e2a\u5b66\u751f\uff0c\u8bbe\u7f6e\u6240\u6709\u5b57\u6bb5\u7684\u4fe1\u606f<\/p>\n<p>\t\t\t\tinsert into students3 values(0,&#8217;\u4e9a\u745f&#8217;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(default,&#8217;\u4e9a\u745f2&#8242;,16,160.5)<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u7ed9\u90e8\u5206\u5b57\u6bb5\u8bbe\u7f6e\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;)<\/p>\n<p>\t\t\t\tinsert into students3(name,age) values(&#8216;\u9c81\u73ed2&#8242;,30) <\/p>\n<p>\t\t\t\u6267\u884c\u591a\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f4&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f5&#8242;,16,160.5);<br \/>\n\t\t\t\tinsert into students3 values(null,&#8217;\u4e9a\u745f6&#8217;,16,160.5)<\/p>\n<p>\t\t\t\u6267\u884c\u4e00\u6761\u8bed\u53e5\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n<p>\t\t\t\tinsert into students3(name) values(&#8216;\u9c81\u73ed&#8217;),(&#8216;\u9c81\u73ed2&#8217;),(&#8216;\u9c81\u73ed3&#8217;),(&#8216;\u9c81\u73ed4&#8242;)<\/p>\n<p>\t\t\u66f4\u65b0\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1aupdate \u8868\u540d set \u52171=\u503c1,\u52172=\u503c2&#8230; where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u4fee\u6539id\u4e3a5\u7684\u5b66\u751f\u6570\u636e\uff0c\u59d3\u540d\u6539\u4e3a \u72c4\u4ec1\u6770\uff0c\u5e74\u9f84\u6539\u4e3a 20<\/p>\n<p>\t\t\t\tupdate students3 set age=10 where id=5<\/p>\n<p>\t\t\t\tupdate students3 set name=&#8217;\u72c4\u4ec1\u6770&#8217;,age=22,height=123.246 where age=20<\/p>\n<p>\t\t\u5220\u9664\u6570\u636e<\/p>\n<p>\t\t\t\u683c\u5f0f\uff1adelete from \u8868\u540d where \u6761\u4ef6<br \/>\n\t\t\t\u4f8b\uff1a\u5220\u9664id\u4e3a6\u7684\u5b66\u751f\u6570\u636e<\/p>\n<p>\t\t\tdelete from hero2 <\/p>\n<p>\t\t\tdelete from students3 where id=12<\/p>\n<p>\t\t\u903b\u8f91\u5220\u9664<\/p>\n<p>\t\t\t1\u3001\u7ed9\u8868\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u540d\u5b57\u53ebisdelete int\u7c7b\u578b \uff0c0\u4ee3\u8868\u672a\u5220\u9664\uff0c1\u4ee3\u8868\u5220\u9664<\/p>\n<p>\t\t\t2\u3001\u628a\u8868\u4e2d\u6240\u6709\u7684\u6570\u636eisdelete\u5b57\u6bb5\u6539\u4e3a0<\/p>\n<p>\t\t\t3\u3001\u60f3\u5220\u9664\u6570\u636e\u65f6\uff0c\u4f7f\u7528update\u8bed\u53e5\uff0c\u628a\u67d0\u6761\u6570\u636e\u7684isdelete\u5b57\u6bb5\u6539\u4e3a1<\/p>\n<p>\t\t\t\tupdate students3 set isdelete=1 where id=5<\/p>\n<p>\t\t\t4\u3001\u5728\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u53ea\u67e5\u8be2isdelete\u4e3a0\u7684\u6570\u636e<\/p>\n<p>\t\t\t\tselect * from students3 where isdelete=0<\/p>\n<p>\t\u67e5\u8be2<\/p>\n<p>\t\t\u67e5\u8be2\u6240\u6709\u5b57\u6bb5<\/p>\n<p>\t\t\tselect * from \u8868\u540d<\/p>\n<p>\t\t\tselect * from students<\/p>\n<p>\t\t\u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5<\/p>\n<p>\t\t\tselect name,hometown from students<\/p>\n<p>\t\t\u7ed9\u5b57\u6bb5\u53d6\u522b\u540d<\/p>\n<p>\t\t\tselect name as \u59d3\u540d,hometown as \u5bb6\u4e61 from students<\/p>\n<p>\t\t\u7ed9\u8868\u53d6\u522b\u540d<\/p>\n<p>\t\t\tselect stu.name,stu.hometown from students as stu<\/p>\n<p>\t\t\u53bb\u91cd\uff0c\u91cd\u590d\u7684\u8bb0\u5f55\u53ea\u663e\u793a\u4e00\u6761\uff0c\u5f53\u663e\u793a\u7684\u4e00\u6574\u884c\u8bb0\u5f55\u8ddf\u53e6\u4e00\u6574\u884c\u8bb0\u5f55\u5b8c\u5168\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u91cd\u590d\u7684\u8bb0\u5f55<\/p>\n<p>\t\t\tselect distinct sex from students<\/p>\n<p>\t\t\tselect distinct sex,class  from students<\/p>\n<p>\t\u6bd4\u8f83\u8fd0\u7b97<\/p>\n<p>\t\t\u4f8b1\uff1a\u67e5\u8be2\u5c0f\u4e54\u7684\u5e74\u9f84<\/p>\n<p>\t\t\tselect age from students where name=&#8217;\u5c0f\u4e54&#8217;<\/p>\n<p>\t\t\u4f8b2\uff1a\u67e5\u8be220\u5c81\u4ee5\u4e0b\u7684\u5b66\u751f<\/p>\n<p>\t\t\tselect * from students where age<=20\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u5bb6\u4e61\u4e0d\u5728\u5317\u4eac\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown<>&#8216;\u5317\u4eac&#8217;<\/p>\n<p>\t\u903b\u8f91\u8fd0\u7b97<\/p>\n<p>\t\t\u4f8b1\uff1a\u67e5\u8be2\u5e74\u9f84\u5c0f\u4e8e20\u7684\u5973\u540c\u5b66<\/p>\n<p>\t\t\tselect * from students where age<20 and sex='\u5973'\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u5b66\u751f\u6216'1\u73ed'\u7684\u5b66\u751f\n\n\t\t\tselect * from students where sex='\u5973' or class='1\u73ed'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u975e\u5929\u6d25\u7684\u5b66\u751f\n\n\t\t\tselect * from students where not hometown='\u5929\u6d25'\n\n\t\u6a21\u7cca\u67e5\u8be2\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u59d3\u5b59\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59%'\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u59d3\u5b59\u4e14\u540d\u5b57\u662f\u4e00\u4e2a\u5b57\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '\u5b59__'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be2\u53eb\u4e54\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u4e54'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u59d3\u540d\u542b\u767d\u7684\u5b66\u751f\n\n\t\t\tselect * from students where name like '%\u767d%'\n\n\t\u8303\u56f4\u67e5\u8be2\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5bb6\u4e61\u662f\u5317\u4eac\u6216\u4e0a\u6d77\u6216\u5e7f\u4e1c\u7684\u5b66\u751f\n\n\t\t\tselect * from students where hometown='\u5317\u4eac' or hometown='\u4e0a\u6d77' or hometown='\u5e7f\u4e1c'\n\n\t\t\tselect * from students where hometown in ('\u5317\u4eac','\u4e0a\u6d77','\u5e7f\u4e1c')\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5e74\u9f84\u4e3a18\u81f320\u7684\u5b66\u751f\n\n\t\t\tselect * from students where age in (18,19,20)\n\n\t\t\tselect * from students where age between 18 and 20   \u5c0f\u503c\u5728\u524d\uff0c\u5927\u503c\u5728\u540e\n\n\t\t\tselect * from students where age>=20 and age<=18\n\n\t\u7a7a\u5224\u65ad\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6ca1\u6709\u586b\u5199\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\n\t\t\tselect * from students where  card is null\n\t\t\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u586b\u5199\u4e86\u8eab\u4efd\u8bc1\u7684\u5b66\u751f\n\t\t\n\t\t\tselect * from students where  card is not null\n\n\t\t'' \u4ee3\u8868\u63d2\u5165\u7684\u6570\u636e\u4e3a\u7a7a\u5b57\u7b26\u4e32\n\n\t\tinsert into students values('013','\u51ef','\u7537','\u5317\u4eac',20,'1\u73ed','')\n\n\t\tnull \u4ee3\u8868\u63d2\u5165\u7684\u503c\u4e3a\u7a7a\n\t\tinsert into students values('014','\u51ef2','\u7537','\u5317\u4eac',20,'1\u73ed',null)\n\n\t\t\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5982\u679c\u4e00\u4e9b\u5b57\u6bb5\u6ca1\u6307\u5b9a\u6570\u636e\uff0c\u9ed8\u8ba4\u4e3anull\n\t\tinsert into students(studentNo,name) values('015','\u51ef3')\n\n\t\u6392\u5e8f\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u4fe1\u606f\uff0c\u6309\u5e74\u9f84\u4ece\u5927\u5230\u5c0f\u6392\u5e8f\uff0c\u5e74\u9f84\u76f8\u540c\u65f6\uff0c\u518d\u6309\u5b66\u53f7\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\n\n\t\t\tselect * from students order by age desc,studentNo \n\n\t\t\u5bf9\u4e2d\u6587\u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\n\t\tselect * from students order by convert(name using gbk)\n\n\t\u805a\u5408\u51fd\u6570\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u603b\u6570\n\n\t\t\tcount(*)\u4ee3\u8868\u5982\u679c\u4e00\u884c\u8bb0\u5f55\u4e2d\u4efb\u4f55\u4e00\u4e2a\u5b57\u6bb5\u6709\u503c\uff0c\u5c31\u4f1a\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(*) from students\n\n\t\t\tcount(card)\u4ee3\u8868\u7edf\u8ba1\u67d0\u4e00\u4e2a\u5217\u7684\u4e2a\u6570\uff0c\u4e0d\u4f1a\u628anull\u503c\u7edf\u8ba1\u5728\u5185\n\t\t\tselect count(card) from students\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5973\u751f\u7684\u6700\u5927\u5e74\u9f84\n\n\t\t\tselect max(age) from students where sex='\u5973'\n\n\t\t\u4f8b3\uff1a\u67e5\u8be21\u73ed\u7684\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect min(age) from students where class='1\u73ed'\n\n\t\t\u4f8b4\uff1a\u67e5\u8be2\u5317\u4eac\u5b66\u751f\u7684\u5e74\u9f84\u603b\u548c\n\n\t\t\tselect sum(age) from students where hometown='\u5317\u4eac'\n\n\t\t\u4f8b5\uff1a\u67e5\u8be2\u5973\u751f\u7684\u5e73\u5747\u5e74\u9f84\n\n\t\t\tselect avg(age) from students where sex='\u5973'\n\n\n\t\u5206\u7ec4\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u5404\u79cd\u6027\u522b\u7684\u4eba\u6570\n\n\t\t\tselect sex,count(*) from students group by sex\n\n\t\t\u4f8b2\uff1a\u67e5\u8be2\u5404\u79cd\u5e74\u9f84\u7684\u4eba\u6570\n\n\t\t\tselect age,count(*) from students group by age\n\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u7537\u751f\u603b\u4eba\u6570    having\u5fc5\u987b\u653e\u5728group by \u540e\u9762\n\n\t\t\tselect count(*) from students where sex='\u7537'\n\n\t\t\tselect sex,count(*) from students group by sex having sex='\u7537'\n\n\n\n\t\t\u67e5\u8be21\u73ed\u9664\u5916\u5176\u4ed6\u73ed\u7ea7\u5b66\u751f\u7684\u5e73\u5747\u5e74\u9f84\u3001\u6700\u5927\u5e74\u9f84\u3001\u6700\u5c0f\u5e74\u9f84\n\n\t\t\tselect class,avg(age),max(age),min(age) from students where class!='1\u73ed' group by class\n\n\t\t\tselect class,avg(age),max(age),min(age) from students group by class having class!='1\u73ed'\n\n\n\t\t\u6309\u7167\u591a\u4e2a\u5b57\u6bb5\u5206\u7ec4\uff0c\u591a\u4e2a\u5b57\u6bb5\u503c\u4e00\u6a21\u4e00\u6837\u65f6\uff0c\u8ba4\u4e3a\u662f\u4e00\u7ec4\u7684\n\n\t\t\tselect class,sex,count(*) from students group by class,sex\n\n\t\u83b7\u53d6\u90e8\u5206\u884c\n\n\t\t\tlimit start,count  mysql\u4e2d\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\u7684\u4f4d\u7f6e\u662f0\n\n\t\t\u4f8b1\uff1a\u67e5\u8be2\u524d3\u884c\u5b66\u751f\u4fe1\u606f  \n\n\t\t\tselect * from students limit 1,2\n\n\t\t\tlimit 2 \u5c31\u7b49\u4e8e limit 0,2\n\n\t\t\u5206\u9875\n\n\t\t\t\u6bcf\u9875\u663e\u793a4\u6761\n\n\n\t\t\t1\u9875\n\t\t\t\n\t\t\t\tselect * from students limit 0,4  (n-1)*4\n\n\t\t\t2\u9875\n\t\t\t\t\n\t\t\t\tselect * from students limit 4,4  \n\n\t\t\t3\u9875\n\n\t\t\t\tselect * from students limit 8,4\n\n\t\u8fde\u63a5\u67e5\u8be2\n\n\t\t\u7b49\u503c\u8fde\u63a5\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u6210\u7ee9\n\n\t\t\t\t\u751f\u6210\u4e34\u65f6\u8868\uff0c\u7136\u540e\u5728\u4e34\u65f6\u8868\u4e2d\u4f7f\u7528\u5173\u8054\u7684\u5b57\u6bb5\u8fdb\u884c\u8fc7\u6ee4\n\n\t\t\t\tselect stu.name,sc.score from students as stu,scores as sc\n\t\t\t\twhere stu.studentNo=sc.studentNo\n\n\t\t\t\t\u5185\u8fde\u63a5\uff0c\u4e0d\u751f\u6210\u4e34\u65f6\u8868\uff0c\u8fde\u63a5\u65f6\u5148\u5224\u65ad\u6761\u4ef6\uff0c\u53ea\u6709\u7b26\u5408\u6761\u4ef6\u624d\u4f1a\u8fde\u63a5\u518d\u653e\u5230\u7ed3\u679c\n\n\t\t\t\tselect * from students as stu\n\t\t\t\tinner join scores as sc on stu.studentNo=sc.studentNo\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u8bfe\u7a0b\u4fe1\u606f\u53ca\u8bfe\u7a0b\u7684\u6210\u7ee9\n\n\t\t\t\tselect * from scores,courses\n\t\t\t\twhere scores.courseNo=courses.courseNo\n\n\t\t\t\tselect * from courses\n\t\t\t\tinner join scores on scores.courseNo=courses.courseNo\n\n\n\t\t\t\u4f8b3\uff1a\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\u53ca\u5b66\u751f\u7684\u8bfe\u7a0b\u5bf9\u5e94\u7684\u6210\u7ee9\n\n\n\t\t\t\tselect\n\t\t\t\t\t*\n\t\t\t\tfrom\n\t\t\t\t\tstudents,\n\t\t\t\t\tscores,\n\t\t\t\t\tcourses\n\t\t\t\twhere\n\t\t\t\tstudents.studentno = scores.studentno\n\t\t\t\tand scores.courseno = courses.courseno \n\n\t\t\t\tselect\n\t\t\t\t\tstudents. name,\n\t\t\t\t\tcourses. name as coursename,\n\t\t\t\t\tscores.score\n\t\t\t\tfrom\n\t\t\t\t\tstudents\n\t\t\t\tinner join scores on students.studentno = scores.studentno\n\t\t\t\tinner join courses on scores.courseno = courses.courseno\n\n\t\t\t\u4f8b7\uff1a\u67e5\u8be2\u7537\u751f\u4e2d\u6700\u9ad8\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u59d3\u540d\u3001\u8bfe\u7a0b\u540d\u3001\u6210\u7ee9\n\n\t\t\t\tselect \n\t\t\t\t\tstudents.sex,students.name,scores.score,courses.name as cName \n\t\t\t\tfrom \n\t\t\t\t\tcourses\n\t\t\t\tinner join scores on courses.courseNo=scores.courseNo\n\t\t\t\tinner join students on students.studentNo=scores.studentno\n\t\t\t\twhere students.sex='\u7537'\n\t\t\t\torder by scores.score desc\n\t\t\t\tlimit 1\n\n\n\t\t\u5de6\u8fde\u63a5\n\n\n\t\t\t\u67e5\u8be2\u6240\u6709\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u5b66\u751f\n\t\t\t\t\n\t\t\t\tjoin \u524d\u9762\u7684\u8868\u4e3a\u5de6\u8868\uff0cjoin \u540e\u9762\u7684\u8868\u4e3a\u53f3\u8868\n\t\t\t\t\n\t\t\t\tselect * from students\n\t\t\t\tleft join scores on students.studentNo=scores.studentno\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u5b66\u751f\uff0c\u9700\u8981\u663e\u793a\u8bfe\u7a0b\u540d\n\t\t\t\t\n\t\t\t\tselect * from students\n\t\t\t\tleft join scores on students.studentNo=scores.studentno\n\t\t\t\tleft join courses on courses.courseNo=scores.courseNo\n\n\t\t\u53f3\u8fde\u63a5\n\n\t\t\tinsert into courses values \n\t\t\t(0, '\u8bed\u6587'),\n\t\t\t(0, '\u6570\u5b66');\n\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u6240\u6709\u8bfe\u7a0b\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u8bfe\u7a0b\n\t\t\t\t\n\t\t\t\tselect * from scores\n\t\t\t\tright join courses on scores.courseNo=courses.courseNo\n\t\t\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u6240\u6709\u8bfe\u7a0b\u7684\u6210\u7ee9\uff0c\u5305\u62ec\u6ca1\u6709\u6210\u7ee9\u7684\u8bfe\u7a0b,\u5305\u62ec\u5b66\u751f\u4fe1\u606f\n\n\t\t\t\tselect * from scores\n\t\t\t\tright join courses on scores.courseNo=courses.courseNo\n\t\t\t\tleft join students on students.studentNo=scores.studentNo\n\n\t\t\t\tselect students.*,scores.*,courses.* from courses\n\t\t\t\tleft join scores on scores.courseNo=courses.courseNo\n\t\t\t\tleft join students on students.studentNo=scores.studentno\n\n\t\t\u81ea\u5173\u8054\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u4e00\u5171\u6709\u591a\u5c11\u4e2a\u7701\n\n\t\t\t\tselect count(*) from areas where pid is null\n\n\t\t\t\u4f8b1\uff1a\u67e5\u8be2\u6cb3\u5357\u7701\u7684\u6240\u6709\u57ce\u5e02\n\n\n\t\t\t\tfrom\u540e\u9762\u8ddf\u7684\u662f\u6570\u636e\u6e90\uff0c\u53ef\u4ee5\u5bf9\u4e00\u4e2a\u6570\u636e\u6e90\u67e5\u8be2\u591a\u6b21\n\n\t\t\t\tselect * from areas as sheng,areas as shi\n\t\t\t\twhere sheng.aid=shi.pid and sheng.atitle='\u6cb3\u5357\u7701'\n\n\n\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u90d1\u5dde\u5e02\u7684\u6240\u6709\u533a\u53bf\n\n\t\t\t\tselect * from areas as shi,areas as qu\n\t\t\t\twhere shi.aid=qu.pid and shi.atitle='\u90d1\u5dde\u5e02'\n\n\t\t\t\u4f8b3\uff1a\u67e5\u8be2\u6cb3\u5357\u7701\u7684\u6240\u6709\u533a\u53bf\n\t\t\t\t\n\t\t\t\tselect * from areas as sheng,areas as shi,areas as qu\n\t\t\t\twhere sheng.aid=shi.pid and qu.pid=shi.aid and sheng.atitle='\u6cb3\u5357\u7701'\n\n\t\t\t\t\u5148\u8fde\u63a5\u7701\u548c\u5e02\uff0c\u518d\u8fde\u63a5\u533a\n\t\t\t\tselect * from areas as sheng\n\t\t\t\tinner join areas as shi on sheng.aid=shi.pid\n\t\t\t\tinner join areas as qu on shi.aid=qu.pid\n\n\t\t\t\t\u5148\u8fde\u63a5\u5e02\u548c\u533a\uff0c\u518d\u8fde\u63a5\u7701\n\t\t\t\tselect * from areas as shi\n\t\t\t\tinner join areas as qu on shi.aid=qu.pid\n\t\t\t\tinner join areas as sheng on shi.pid=sheng.aid\n\n\t\t\t\t\u67e5\u8be2\u6cb3\u5357\u7701\u6240\u6709\u7684\u5e02\u548c\u533a\n\t\t\t\tselect * from areas as sheng\n\t\t\t\tinner join areas as shi on sheng.aid=shi.pid\n\t\t\t\tleft join areas as qu on shi.aid=qu.pid \n\t\t\t\twhere sheng.atitle='\u6cb3\u5357\u7701'\n\n\t\t\u5b50\u67e5\u8be2\n\n\t\t\u6807\u91cf\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u884c\u4e00\u5217\n\t\t\t\u67e5\u8be2\u5927\u4e8e\u5e73\u5747\u5e74\u9f84\u7684\u5b66\u751f\n\n\t\t\t\tselect avg(age) from students\n\n\t\t\t\t-- 21.5833\n\n\t\t\t\tselect * from students where age>21.5833<\/p>\n<p>\t\t\t\tselect * from students where age>(select avg(age) from students)<\/p>\n<p>\t\t\t\u4f8b2\uff1a\u67e5\u8be2\u738b\u662d\u541b\u7684\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect studentNo from students where name=&#8217;\u738b\u662d\u541b&#8217;<\/p>\n<p>\t\t\t\tselect score from scores where studentNo=(select studentNo from students where name=&#8217;\u738b\u662d\u541b&#8217;)<\/p>\n<p>\t\t\u5217\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u5217\u591a\u884c<br \/>\n\t\t\t\u4f8b3\uff1a\u67e5\u8be218\u5c81\u7684\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u8981\u6c42\u663e\u793a\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect studentNo from students where age=18<\/p>\n<p>\t\t\t\tselect * from scores where studentNo in(select studentNo from students where age=18)<\/p>\n<p>\t\t\u884c\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u884c\u591a\u5217<br \/>\n\t\t\t\u4f8b4\uff1a\u67e5\u8be2\u7537\u751f\u4e2d\u5e74\u9f84\u6700\u5927\u7684\u5b66\u751f\u4fe1\u606f<\/p>\n<p>\t\t\t\tselect * from students where sex=&#8217;\u7537&#8217; and age=(select max(age) from students where sex=&#8217;\u7537&#8217;)<\/p>\n<p>\t\t\t\tselect * from students where sex=&#8217;\u7537&#8217; and age=30<\/p>\n<p>\t\t\t\tselect * from students where (sex,age)=(&#8216;\u7537&#8217;,30)<\/p>\n<p>\t\t\t\tselect * from students<br \/>\n\t\t\t\twhere (sex,age)=(select sex,age from students where sex=&#8217;\u7537&#8217; order by age desc limit 1)<\/p>\n<p>\t\t\u8868\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u7ed9\u53e6\u4e00\u4e2a\u67e5\u8be2\u5f53\u4f5c\u8868\u6765\u4f7f\u7528<\/p>\n<p>\t\t\t\u4f8b5\uff1a\u67e5\u8be2\u6570\u636e\u5e93\u548c\u7cfb\u7edf\u6d4b\u8bd5\u7684\u8bfe\u7a0b\u6210\u7ee9<\/p>\n<p>\t\t\t\tselect * from scores<br \/>\n\t\t\t\tinner join courses on scores.courseNo=courses.courseNo<br \/>\n\t\t\t\twhere courses.name in (&#8216;\u6570\u636e\u5e93&#8217;,&#8217;\u7cfb\u7edf\u6d4b\u8bd5&#8217;)<\/p>\n<p>\t\t\t\tselect * from scores<br \/>\n\t\t\t\tinner join<br \/>\n\t\t\t\t(select * from courses where name in  (&#8216;\u6570\u636e\u5e93&#8217;,&#8217;\u7cfb\u7edf\u6d4b\u8bd5&#8217;)) as c<br \/>\n\t\t\t\ton scores.courseNo=c.courseNo<\/p>\n<p>\t\u67e5\u8be2\u6f14\u7ec3<\/p>\n<p>\t\t\u6c42\u6240\u6709\u7535\u8111\u4ea7\u54c1\u7684\u5e73\u5747\u4ef7\u683c,\u5e76\u4e14\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570<\/p>\n<p>\t\t\tselect round(avg(price),2) from goods<\/p>\n<p>\t\t\u67e5\u8be2\u6240\u6709\u4ef7\u683c\u5927\u4e8e\u5e73\u5747\u4ef7\u683c\u7684\u5546\u54c1\uff0c\u5e76\u4e14\u6309\u4ef7\u683c\u964d\u5e8f\u6392\u5e8f<\/p>\n<p>\t\t\tselect * from goods where price>(select round(avg(price),2) from goods) order by price desc<\/p>\n<p>\t\t\u67e5\u8be2\u7c7b\u578b\u4e3a&#8217;\u8d85\u6781\u672c&#8217;\u7684\u5546\u54c1\u4ef7\u683c<\/p>\n<p>\t\t\tselect price from goods where cate=&#8217;\u8d85\u7ea7\u672c&#8217;<\/p>\n<p>\t\t\u67e5\u8be2\u4ef7\u683c\u5927\u4e8e\u6216\u7b49\u4e8e&#8221;\u8d85\u7ea7\u672c&#8221;\u4ef7\u683c\u7684\u5546\u54c1\uff0c\u5e76\u4e14\u6309\u4ef7\u683c\u964d\u5e8f\u6392\u5217<\/p>\n<p>\t\t\tselect * from goods where price >=any(select price from goods where cate=&#8217;\u8d85\u7ea7\u672c&#8217;) order by price desc<\/p>\n<p>\t\t\u521b\u5efa\u7c7b\u578b\u8868<\/p>\n<p>\t\t\tcreate table goods_cates(<br \/>\n\t\t\tcate_id int unsigned primary key auto_increment,<br \/>\n\t\t\tcate_name varchar(10)<br \/>\n\t\t\t)<\/p>\n<p>\t\t\tselect distinct cate from goods<br \/>\n\t\t\tselect cate from goods group by cate<\/p>\n<p>\t\t\t\u63d2\u5165\u6570\u636e\uff0c\u67e5\u8be2\u51fa\u6765\u7684\u5b57\u6bb5\u9700\u8981\u548c\u60f3\u63d2\u5165\u7684\u5b57\u6bb5\u4fdd\u6301\u987a\u5e8f\u4e00\u81f4<br \/>\n\t\t\tinsert into goods_cates(cate_name) select distinct cate from goods<\/p>\n<p>\t\t\u521b\u5efa\u54c1\u724c\u8868,\u5e76\u4e14\u63d2\u5165\u6570\u636e\uff0c\u67e5\u8be2\u51fa\u6765\u7684\u5b57\u6bb5\u540d\u9700\u8981\u548c\u60f3\u63d2\u5165\u7684\u5b57\u6bb5\u540d\u4e00\u6a21\u4e00\u6837<\/p>\n<p>\t\t\tcreate table goods_brands(<br \/>\n\t\t\tbrand_id int unsigned primary key auto_increment,<br \/>\n\t\t\tbrand_name varchar(10)<br \/>\n\t\t\t)<br \/>\n\t\t\tselect distinct brand_name from goods<\/p>\n<p>\t\t\u66f4\u65b0\u5546\u54c1\u8868\u7684\u7c7b\u578b<\/p>\n<p>\t\t\tselect * from goods<br \/>\n\t\t\tinner join goods_cates on goods.cate=goods_cates.cate_name<\/p>\n<p>\t\t\tupdate goods<br \/>\n\t\t\tinner join goods_cates on goods.cate=goods_cates.cate_name<br \/>\n\t\t\tset goods.cate=goods_cates.cate_id<\/p>\n<p>\t\t\u66f4\u65b0\u5546\u54c1\u8868\u7684\u54c1\u724c<\/p>\n<p>\t\t\tupdate goods<br \/>\n\t\t\tinner join goods_brands on goods.brand_name=goods_brands.brand_name<br \/>\n\t\t\tset goods.brand_name=goods_brands.brand_id<\/p>\n<p>\t\t\u67e5\u8be2\u5546\u54c1\u4fe1\u606f\uff0c\u5305\u62ec\u54c1\u724c\u3001\u7c7b\u578b<\/p>\n<p>\t\t\tselect goods.id,goods.name,goods_cates.cate_name,goods_brands.brand_name from goods<br \/>\n\t\t\tinner join goods_cates on goods.cate_id=goods_cates.cate_id<br \/>\n\t\t\tinner join goods_brands on goods.brand_id=goods_brands.brand_id<\/p>\n<p>\t\u547d\u4ee4\u884c\u5ba2\u6237\u7aef<\/p>\n<p>\t\t\u8fde\u63a5\u670d\u52a1\u7aef<br \/>\n\t\tmysql -uroot -p  \u56de\u8f66\u540e\uff0c\u8f93\u5165\u5bc6\u7801<\/p>\n<p>\t\t\u663e\u793a\u6240\u6709\u4ed3\u5e93<br \/>\n\t\tshow databases;<\/p>\n<p>\t\t\u6253\u5f00\u67d0\u4e2a\u4ed3\u5e93<br \/>\n\t\tuse ceshi;<\/p>\n<p>\t\t\u663e\u793a\u5f53\u524d\u4ed3\u5e93\u6240\u6709\u7684\u8868<br \/>\n\t\tshow tables;<\/p>\n<p>\t\t\u663e\u793a\u8868\u7ed3\u6784<br \/>\n\t\tdesc students;<\/p>\n<p>\t\t\u4e2d\u6587\u4e71\u7801<br \/>\n\t\tset charset gbk;<\/p>\n<p>\t\u51fd\u6570<\/p>\n<p>\t\t\u968f\u673a\u4ece\u4e00\u4e2a\u8868\u4e2d\u53d6\u4e00\u6761\u6570\u636e<br \/>\n\t\tselect * from goods order by rand() limit 1<\/p>\n<p>\t\u89c6\u56fe<\/p>\n<p>\t\t\u521b\u5efa\u89c6\u56fe<\/p>\n<p>\t\t\tcreate view v_students as<br \/>\n\t\t\tselect name as \u59d3\u540d,sex \u6027\u522b,age \u5e74\u9f84 from students<\/p>\n<p>\t\t\u67e5\u8be2\u89c6\u56fe<\/p>\n<p>\t\t\tselect * from v_students<\/p>\n<p>\t\t\u5220\u9664\u89c6\u56fe<\/p>\n<p>\t\t\tdrop view v_students<\/p>\n<p>\t\u4e8b\u52a1<\/p>\n<p>\t\t\u8f6c\u8d26<\/p>\n<p>\t\t\t\u5927\u4e54 500<br \/>\n\t\t\t\u5c0f\u4e54 200<\/p>\n<p>\t\t\tupdate  set account=500-100 where name=&#8217;\u5927\u4e54&#8217;<\/p>\n<p>\t\t\tupdate  set account=200+100 where name=&#8217;\u5c0f\u4e54&#8217;<\/p>\n<p>\t\t\t\u63d0\u4ea4\uff0c\u6240\u6709\u6b65\u9aa4\u90fd\u6267\u884c\u6210\u529f\uff0c\u624d\u63d0\u4ea4<\/p>\n<p>\t\t\t\tbegin;   \u5f00\u542f\u4e8b\u52a1<\/p>\n<p>\t\t\t\tupdate students set age=age-10 where name=&#8217;\u5927\u4e54&#8217;;<\/p>\n<p>\t\t\t\tupdate students set age=age+10 where name=&#8217;\u5c0f\u4e54&#8217;;<\/p>\n<p>\t\t\t\tcommit;   commit\u540e\uff0c\u6570\u636e\u624d\u53d8\u5316\u5230\u8868\u4e2d<\/p>\n<p>\t\t\t\u56de\u6eda\uff0c\u4efb\u4f55\u4e00\u6b65\u5931\u8d25\uff0c\u56de\u5230\u4ee5\u524d\u7684\u72b6\u6001<\/p>\n<p>\t\t\t\tbegin;<\/p>\n<p>\t\t\t\tupdate students set age=age-10 where name=&#8217;\u5927\u4e54&#8217;;<\/p>\n<p>\t\t\t\tupdate students setb age=age+10 where name=&#8217;\u5c0f\u4e54&#8217;;<\/p>\n<p>\t\t\t\trollback;   rollback\u540e\uff0c\u6240\u6709\u7684\u64cd\u4f5c\u5168\u90e8\u5931\u8d25\uff0c\u6570\u636e\u56de\u5230\u539f\u59cb\u72b6\u6001<\/p>\n<p>\t\u7d22\u5f15<\/p>\n<p>\t\t\u867d\u7136\u7d22\u5f15\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u901f\u5ea6\uff0c\u540c\u65f6\u5374\u4f1a\u964d\u4f4e\u66f4\u65b0\u8868\u7684\u901f\u5ea6\uff0c\u5982\u5bf9\u8868\u8fdb\u884cINSERT\u3001UPDATE\u548cDELETE\uff0c\u56e0\u4e3a\u66f4\u65b0\u8868\u65f6\uff0cMySQL\u4e0d\u4ec5\u8981\u4fdd\u5b58\u6570\u636e\uff0c\u8fd8\u8981\u4fdd\u5b58\u4e00\u4e0b\u7d22\u5f15\u6587\u4ef6<\/p>\n<p>\t\u5916\u952e<\/p>\n<p>\t\t\u4ece\u8868\u7684\u4e00\u5217\uff0c\u88ab\u4e3b\u8868\u7684\u4e00\u5217\u7ea6\u675f\uff0c\u4ece\u8868\u88ab\u7ea6\u675f\u7684\u4e00\u5217\u7684\u503c\uff0c\u5fc5\u987b\u5728\u4e3b\u8868\u4e3b\u8868\u4e2d\u90a3\u4e00\u5217\u503c\u7684\u8303\u56f4\u5185<\/p>\n<p>\t\t\u5916\u952e\u7ea6\u675f,\u4f1a\u6781\u5927\u7684\u964d\u4f4e\u8868\u66f4\u65b0\u7684\u6548\u7387<\/p>\n<p>\t\u4fee\u6539\u5bc6\u7801<\/p>\n<p>\t\t\u5728mysql\u4ed3\u5e93\u4e0b\u6267\u884c<\/p>\n<p>\t\t\t\u66f4\u65b0\u5bc6\u7801<br \/>\n\t\t\tupdate user set password=password(&#8216;111&#8217;)<\/p>\n<p>\t\t\t\u5237\u65b0\u6743\u9650<br \/>\n\t\t\tflush privileges<\/p>\n<p>\u8f6f\u4ef6\u5b89\u88c5\u603b\u7ed3<br \/>\n\u89e3\u538b tar \u4f5c\u7528\uff1a\u89e3\u538b\u6587\u4ef6\uff0c\u83b7\u53d6\u771f\u6b63\u7684\u914d\u7f6e\u6587\u4ef6<br \/>\n\u914d\u7f6e configure \u4f5c\u7528\uff1a\u6839\u636e\u9ed8\u8ba4\u7684\u914d\u7f6e\u9879\u6216\u8005\u66f4\u6539\u914d\u7f6e\u9879\uff0c\u751f\u6210\u7f16\u8bd1\u914d\u7f6e\u6587\u4ef6(Makefile)<br \/>\n\u7f16\u8bd1 make \u4f5c\u7528\uff1a\u6839\u636e Makefile \u5185\u5bb9\uff0c\u7f16\u8bd1\u751f\u6210\u6307\u5b9a\u7684\u8f6f\u4ef6\u6240\u9700\u8981\u7684\u6240\u6709\u6587\u4ef6<br \/>\n\u5b89\u88c5 make install \u4f5c\u7528\uff1a\u5c06\u7f16\u8bd1\u751f\u6210\u7684\u6240\u6709\u6587\u4ef6\uff0c\u8f6c\u79fb\u5230\u8f6f\u4ef6\u6307\u5b9a\u5b89\u88c5\u7684\u76ee\u5f55\u4e0b\u9762<\/p>\n<p>nginx\u64cd\u4f5c<\/p>\n<p>\t\u542f\u52a8nginx<br \/>\n\t\/data\/server\/nginx\/sbin\/nginx<\/p>\n<p>\t\u542f\u52a8\u540e\u68c0\u67e5<br \/>\n\tnetstat -tnulp | grep nginx<\/p>\n<p>mysql\u64cd\u4f5c<\/p>\n<p>\t\u542f\u52a8\u6570\u636e\u5e93<br \/>\n\tservice mysqld start<\/p>\n<p>\t\u68c0\u67e5\u6570\u636e\u5e93\u542f\u52a8\u72b6\u6001<br \/>\n\tnetstat -tnulp|grep mysqld<\/p>\n<p>\t\u5ba2\u6237\u7aef\u8fde\u63a5\u670d\u52a1\u7aef<br \/>\n\tmysq -uroot<\/p>\n<p>php\u64cd\u4f5c<\/p>\n<p>\t\u542f\u52a8php<br \/>\n\t\/data\/server\/php\/sbin\/php-fpm<\/p>\n<p>\t\u5173\u95edphp<br \/>\n\tpkill php-fpm<\/p>\n<p>\tnetstat -tnulp|grep php<\/p>\n<p>\u4e00\u4e2a\u7f51\u7ad9\u8fd0\u884c\u9700\u8981\u7684\u73af\u5883<\/p>\n<p>\t\u4e00\u4e2a\u670d\u52a1\u5668\uff08linux\u7cfb\u7edf\uff09<br \/>\n\tweb\u670d\u52a1\u8f6f\u4ef6\uff08nginx\uff09<br \/>\n\tphp\u8f6f\u4ef6<br \/>\n\t\u6570\u636e\u5e93\uff08mysql\uff09<\/p>\n<p>\u7f51\u7ad9\u8981\u6b63\u5e38\u8bbf\u95ee<\/p>\n<p>\tnginx\uff0cphp\uff0cmysql\u90fd\u542f\u52a8<\/p>\n<p>linux\u4e2d\u7684navicat\u8fc7\u671f\u540e\uff0c\u5220\u9664\/home\/admin\u4e0b\u7684.navicat64\u6587\u4ef6\u5939\u5373\u53ef<\/p>\n<p>rm -rf \/home\/admin\/.navicat64<\/p>\n<p>1\u3001linux\u4e2d\u7684navicat\u8fde\u63a5windows\u4e2d\u7684mysql\u670d\u52a1\u7aef<\/p>\n<p>\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801<\/p>\n<p>2\u3001windows\u4e2d\u7684navicat\u8fde\u63a5linux\u4e2d\u7684mysql\u670d\u52a1\u5668<\/p>\n<p>\t\u8bbe\u7f6emysql\u652f\u6301\u8fdc\u7a0b\u8fde\u63a5<\/p>\n<p>\t\t\u4fee\u6539\u4e00\u4e2aroot\u7528\u6237\u7684host\u4e3a%<\/p>\n<p>\t\tflush privileges<\/p>\n<p>\t\u8f93\u5165ip\u3001\u7aef\u53e3\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801<\/p>\n","protected":false},"excerpt":{"rendered":"<p>4\u5929 \u6570\u636e\u5e93\u6982\u5ff5 mysql navicat sql\u8bed\u53e5 \u67e5\u8be2 mysql\u9ad8\u7ea7 1\u3001\u6982\u5ff5 1.1\u3001\u6570\u636e\u5e93\u7684\u4f5c\u7528 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1627,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"content_type":[],"class_list":["post-1626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zzjy"],"_links":{"self":[{"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/posts\/1626","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1626"}],"version-history":[{"count":0,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/posts\/1626\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=\/wp\/v2\/media\/1627"}],"wp:attachment":[{"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1626"},{"taxonomy":"content_type","embeddable":true,"href":"https:\/\/www.aiersheng.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcontent_type&post=1626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}