{"id":74500,"date":"2026-02-09T23:25:29","date_gmt":"2026-02-09T15:25:29","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/74500.html"},"modified":"2026-02-09T23:25:29","modified_gmt":"2026-02-09T15:25:29","slug":"%e4%b8%80%e6%96%87%e7%b2%be%e9%80%9amysql%ef%bc%9a%e4%bb%8e%e5%8e%86%e5%8f%b2%e6%bc%94%e5%8f%98%e5%88%b0%e5%ae%9e%e6%88%98%e6%93%8d%e4%bd%9c%ef%bc%8c%e6%95%b0%e6%8d%ae%e5%ba%93%e6%a0%b8%e5%bf%83","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/74500.html","title":{"rendered":"\u4e00\u6587\u7cbe\u901aMySQL\uff1a\u4ece\u5386\u53f2\u6f14\u53d8\u5230\u5b9e\u6218\u64cd\u4f5c\uff0c\u6570\u636e\u5e93\u6838\u5fc3\u5168\u638c\u63e1"},"content":{"rendered":"<h3>\u6458\u8981<\/h3>\n<p>\u4f60\u662f\u5426\u66fe\u88ab\u6570\u636e\u5e93\u7684\u5404\u79cd\u6982\u5ff5\u641e\u5f97\u6655\u5934\u8f6c\u5411\uff1f\u662f\u5426\u5728SQL\u8bed\u53e5\u7684\u6d77\u6d0b\u4e2d\u8ff7\u5931\u65b9\u5411\uff1f\u672c\u6587\u5c06\u5e26\u4f60\u7a7f\u8d8aMySQL\u7684\u53d1\u5c55\u5386\u53f2\uff0c\u63ed\u79d8\u5173\u7cfb\u578b\u4e0e\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u672c\u8d28\u533a\u522b\uff0c\u5e76\u901a\u8fc7\u5927\u91cf\u5b9e\u6218\u6848\u4f8b\uff0c\u624b\u628a\u624b\u6559\u4f60\u638c\u63e1DDL\u3001\u7ea6\u675f\u3001\u7a97\u53e3\u51fd\u6570\u7b49\u6838\u5fc3\u6982\u5ff5\u3002\u65e0\u8bba\u4f60\u662f\u521d\u5b66\u8005\u8fd8\u662f\u5e0c\u671b\u7cfb\u7edf\u68b3\u7406\u77e5\u8bc6\u7684\u5f00\u53d1\u8005\uff0c\u8fd9\u7bc7\u4e07\u5b57\u957f\u6587\u90fd\u5c06\u4e3a\u4f60\u6253\u5f00\u6570\u636e\u5e93\u4e16\u754c\u7684\u5927\u95e8\uff01<\/p>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981\u6570\u636e\u5e93\uff1f\u6587\u4ef6\u5b58\u50a8\u7684\u5c40\u9650\u6027<\/h3>\n<p>\u5728\u6df1\u5165MySQL\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u601d\u8003\u4e00\u4e2a\u57fa\u672c\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u9700\u8981\u6570\u636e\u5e93\uff1f\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u4f7f\u7528\u6587\u4ef6\u7cfb\u7edf\uff08\u5982Excel\u3001txt\u6587\u4ef6\uff09\u5b58\u50a8\u6570\u636e\uff1f<\/p>\n<h4>\u6587\u4ef6\u5b58\u50a8\u7684\u75db\u70b9<\/h4>\n<p>\u60f3\u8c61\u4e00\u4e0b\uff0c\u4f60\u6b63\u5728\u7ba1\u7406\u4e00\u4e2a\u5b66\u6821\u7684\u6559\u52a1\u7cfb\u7edf\uff1a<\/p>\n<p>\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4<\/p>\n<p>\u5b66\u751f\u4fe1\u606f.txt \u6587\u4ef6\uff1a \u5b66\u53f7,\u59d3\u540d,\u73ed\u7ea7,\u5e74\u9f84 2023001,\u5f20\u4e09,\u8ba1\u7b97\u673a1\u73ed,18 2023002,\u674e\u56db,\u8ba1\u7b97\u673a1\u73ed,19 \u200b \u6210\u7ee9\u8bb0\u5f55.txt \u6587\u4ef6\uff1a \u5b66\u53f7,\u59d3\u540d,\u8bfe\u7a0b,\u6210\u7ee9&nbsp; # \u59d3\u540d\u91cd\u590d\u5b58\u50a8\uff01 2023001,\u5f20\u4e09,\u6570\u636e\u5e93,85 2023001,\u5f20\u4e09,\u7b97\u6cd5,90<\/p>\n<p>\u5e76\u53d1\u8bbf\u95ee\u95ee\u9898<\/p>\n<p>\u6559\u5e08A\u6b63\u5728\u4fee\u6539\u5b66\u751f\u5f20\u4e09\u7684\u6210\u7ee9 \u540c\u65f6\u6559\u5e08B\u4e5f\u5728\u4fee\u6539\u5f20\u4e09\u7684\u6210\u7ee9 \u7ed3\u679c\uff1a\u6700\u540e\u4fdd\u5b58\u7684\u6587\u4ef6\u4f1a\u8986\u76d6\u4e4b\u524d\u7684\u4fee\u6539\uff01<\/p>\n<p>\u6570\u636e\u67e5\u627e\u6548\u7387\u4f4e\u4e0b<\/p>\n<p>\u8981\u572810000\u6761txt\u8bb0\u5f55\u4e2d\u627e\u51fa\u6240\u6709\u4e0d\u53ca\u683c\u7684\u5b66\u751f\uff1a &#8211; \u9700\u8981\u9010\u884c\u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6 &#8211; \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n) &#8211; \u65e0\u6cd5\u5feb\u901f\u5b9a\u4f4d\u6570\u636e<\/p>\n<p>\u7f3a\u4e4f\u6570\u636e\u5b8c\u6574\u6027\u4fdd\u969c<\/p>\n<p>\u5b66\u751f\u4fe1\u606f.txt\uff1a 2023003,\u738b\u4e94,\u4e0d\u5b58\u5728\u7684\u73ed\u7ea7,200\u5c81&nbsp; # \u6570\u636e\u660e\u663e\u9519\u8bef\uff01<\/p>\n<h4>\u6570\u636e\u5e93\u7684\u4f18\u52bf<\/h4>\n<p>\u6570\u636e\u5171\u4eab\u4e0e\u5e76\u53d1\u63a7\u5236<\/p>\n<p>&#8212; \u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u5904\u7406\u5e76\u53d1 BEGIN TRANSACTION; UPDATE scores SET score = 85 WHERE student_id = 1; &#8212; \u5176\u4ed6\u7528\u6237\u540c\u65f6\u4fee\u6539\u65f6\u4f1a\u7b49\u5f85\u6216\u62a5\u9519 COMMIT;<\/p>\n<p>\u9ad8\u6548\u7684\u6570\u636e\u68c0\u7d22<\/p>\n<p>&#8212; \u521b\u5efa\u7d22\u5f15\uff0c\u67e5\u8be2\u901f\u5ea6\u63d0\u53471000\u500d+ CREATE INDEX idx_student_score ON scores(student_id, score); SELECT * FROM scores WHERE student_id = 1 AND score &gt; 60;<\/p>\n<p>\u6570\u636e\u5b8c\u6574\u6027\u4fdd\u969c<\/p>\n<p>&#8212; \u5e74\u9f84\u5fc5\u987b\u5728\u5408\u7406\u8303\u56f4\u5185 ALTER TABLE students ADD CONSTRAINT chk_age CHECK (age BETWEEN 15 AND 60); \u200b &#8212; \u5b66\u53f7\u5fc5\u987b\u552f\u4e00 ALTER TABLE students ADD UNIQUE (student_no);<\/p>\n<p>\u6570\u636e\u5b89\u5168\u63a7\u5236<\/p>\n<p>&#8212; \u53ea\u5141\u8bb8\u6559\u5e08\u89d2\u8272\u67e5\u770b\u6210\u7ee9 GRANT SELECT ON scores TO teacher_role; \u200b &#8212; \u5b66\u751f\u53ea\u80fd\u67e5\u770b\u81ea\u5df1\u7684\u6210\u7ee9 CREATE VIEW student_own_scores AS SELECT * FROM scores WHERE student_id = CURRENT_USER_ID();<\/p>\n<h3>MySQL\u7684\u524d\u4e16\u4eca\u751f\uff1a\u4e00\u4e2a\u5f00\u6e90\u4f20\u5947<\/h3>\n<h4>\u8bde\u751f\u4e0e\u65e9\u671f\u53d1\u5c55<\/h4>\n<p>MySQL\u7684\u6545\u4e8b\u59cb\u4e8e1995\u5e74\uff0c\u7531\u745e\u5178\u516c\u53f8MySQL AB\u521b\u7acb\uff0c\u521b\u59cb\u4eba\u662fDavid Axmark\u548cMichael \\&#8221;Monty\\&#8221; Widenius\u3002MySQL\u7684\u540d\u5b57\u6765\u6e90\u4e8eMonty\u7684\u5973\u513f\\&#8221;My\\&#8221;\uff0c\\&#8221;SQL\\&#8221;\u5219\u662f\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\u7684\u7f29\u5199\u3002\u6700\u521d\uff0cMySQL\u5b9a\u4f4d\u4e3a\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u3001\u5feb\u901f\u3001\u6613\u7528\u7684\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u4e3b\u8981\u9762\u5411Web\u5e94\u7528\u3002<\/p>\n<h4>\u5173\u952e\u53d1\u5c55\u91cc\u7a0b\u7891<\/h4>\n<ul>\n<li>2000\u5e74\uff1a\u5f00\u6e90\u53d1\u5e03\uff0c\u91c7\u7528GPL\u8bb8\u53ef\u8bc1<\/li>\n<li>2008\u5e74\uff1a\u88abSun Microsystems\u4ee510\u4ebf\u7f8e\u5143\u6536\u8d2d<\/li>\n<li>2010\u5e74\uff1aOracle\u6536\u8d2dSun\uff0cMySQL\u5f52\u5c5eOracle\u65d7\u4e0b<\/li>\n<li>2010\u5e74\u81f3\u4eca\uff1a\u5728Oracle\u7684\u7ba1\u7406\u4e0b\u6301\u7eed\u53d1\u5c55\uff0c\u540c\u65f6\u51fa\u73b0\u4e86MariaDB\uff08MySQL\u521b\u59cb\u4ebaMonty\u521b\u5efa\u7684\u5206\u652f\uff09\u7b49\u66ff\u4ee3\u54c1<\/li>\n<\/ul>\n<h4>MySQL\u7684\u6210\u529f\u79d8\u8bc0<\/h4>\n<p>MySQL\u4e4b\u6240\u4ee5\u80fd\u5728\u6fc0\u70c8\u7684\u6570\u636e\u5e93\u7ade\u4e89\u4e2d\u8131\u9896\u800c\u51fa\uff0c\u4e3b\u8981\u5f97\u76ca\u4e8e\uff1a<\/p>\n<ul>\n<li>\u5f00\u6e90\u514d\u8d39\uff1a\u964d\u4f4e\u4e86\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\u7684\u4f7f\u7528\u95e8\u69db<\/li>\n<li>\u6027\u80fd\u4f18\u5f02\uff1a\u5728\u5904\u7406\u8bfb\u5bc6\u96c6\u578b\u64cd\u4f5c\u4e0a\u8868\u73b0\u51fa\u8272<\/li>\n<li>\u7b80\u5355\u6613\u7528\uff1a\u5b66\u4e60\u66f2\u7ebf\u5e73\u7f13\uff0c\u90e8\u7f72\u5feb\u901f<\/li>\n<li>\u793e\u533a\u5f3a\u5927\uff1a\u62e5\u6709\u6d3b\u8dc3\u7684\u5f00\u6e90\u793e\u533a\u652f\u6301<\/li>\n<\/ul>\n<h3>\u6570\u636e\u5e93\u7c7b\u578b\uff1a\u5173\u7cfb\u578bvs\u975e\u5173\u7cfb\u578b<\/h3>\n<h4>\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08RDBMS\uff09<\/h4>\n<p>\u6838\u5fc3\u7279\u5f81\uff1a\u6570\u636e\u4ee5\u8868\u683c\u5f62\u5f0f\u5b58\u50a8\uff0c\u8868\u4e0e\u8868\u4e4b\u95f4\u901a\u8fc7\u5173\u7cfb\u8fde\u63a5<\/p>\n<p>\u4f18\u70b9\uff1a<\/p>\n<ul>\n<li>\u6570\u636e\u7ed3\u6784\u5316\uff0c\u4e00\u81f4\u6027\u5f3a<\/li>\n<li>\u652f\u6301\u590d\u6742\u7684\u67e5\u8be2\u548c\u4e8b\u52a1\u5904\u7406<\/li>\n<li>\u6570\u636e\u5b8c\u6574\u6027\u597d\uff08ACID\u7279\u6027\uff09<\/li>\n<\/ul>\n<p>\u4ee3\u8868\u4ea7\u54c1\uff1aMySQL\u3001PostgreSQL\u3001Oracle\u3001SQL Server<\/p>\n<p>\u5178\u578b\u573a\u666f\uff1a\u94f6\u884c\u4ea4\u6613\u7cfb\u7edf\u3001ERP\u7cfb\u7edf\u3001\u8d22\u52a1\u7cfb\u7edf\u7b49\u9700\u8981\u5f3a\u4e00\u81f4\u6027\u7684\u573a\u666f<\/p>\n<h4>\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08NoSQL\uff09<\/h4>\n<p>\u6838\u5fc3\u7279\u5f81\uff1a\u4e0d\u4f7f\u7528\u56fa\u5b9a\u7684\u8868\u7ed3\u6784\uff0c\u6570\u636e\u6a21\u578b\u7075\u6d3b<\/p>\n<p>\u4e3b\u8981\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li>\u6587\u6863\u578b\uff1aMongoDB\u3001CouchDB<\/li>\n<li>\u952e\u503c\u578b\uff1aRedis\u3001Memcached<\/li>\n<li>\u5217\u5b58\u50a8\uff1aCassandra\u3001HBase<\/li>\n<li>\u56fe\u6570\u636e\u5e93\uff1aNeo4j<\/li>\n<\/ul>\n<p>\u4f18\u70b9\uff1a<\/p>\n<ul>\n<li>\u7075\u6d3b\u6027\u9ad8\uff0c\u6a21\u5f0f\u81ea\u7531<\/li>\n<li>\u6269\u5c55\u6027\u597d\uff0c\u9002\u5408\u5206\u5e03\u5f0f\u73af\u5883<\/li>\n<li>\u8bfb\u5199\u6027\u80fd\u9ad8<\/li>\n<\/ul>\n<p>\u5178\u578b\u573a\u666f\uff1a\u793e\u4ea4\u7f51\u7edc\u3001\u7269\u8054\u7f51\u3001\u5b9e\u65f6\u5206\u6790\u7b49\u5927\u6570\u636e\u573a\u666f<\/p>\n<h4>\u73b0\u4ee3\u6570\u636e\u5e93\u8d8b\u52bf<\/h4>\n<p>\u5982\u4eca\uff0c\u8bb8\u591a\u4f01\u4e1a\u91c7\u7528\u6df7\u5408\u67b6\u6784\uff0c\u6839\u636e\u4e0d\u540c\u7684\u4e1a\u52a1\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u5e93\u7c7b\u578b\u3002\u540c\u65f6\uff0cNewSQL\uff08\u5982Google Spanner\u3001TiDB\uff09\u4e5f\u5728\u5d1b\u8d77\uff0c\u8bd5\u56fe\u7ed3\u5408\u5173\u7cfb\u578b\u548c\u975e\u5173\u7cfb\u578b\u7684\u4f18\u70b9\u3002<\/p>\n<h3>SQL\u8bed\u8a00\u5206\u7c7b\uff1aDDL\u3001DML\u3001DQL\u3001DCL\u8be6\u89e3<\/h3>\n<h4>DDL\uff08\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09<\/h4>\n<p>\u8d1f\u8d23\u5b9a\u4e49\u548c\u4fee\u6539\u6570\u636e\u5e93\u7ed3\u6784\uff0c\u5305\u62ec\u6570\u636e\u5e93\u3001\u8868\u3001\u5217\u7b49\u5bf9\u8c61\u7684\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u3002<\/p>\n<ul>\n<li>\u521b\u5efa\uff08CREATE\uff09\uff1a\u65b0\u5efa\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n<p>&#8212; \u521b\u5efa\u6570\u636e\u5e93<br \/>\nCREATE DATABASE \u6570\u636e\u5e93\u540d;<\/p>\n<p>&#8212; \u521b\u5efa\u8868<br \/>\nCREATE TABLE \u8868\u540d (<br \/>\n    \u5217\u540d \u6570\u636e\u7c7b\u578b [\u7ea6\u675f],<br \/>\n    \u5217\u540d \u6570\u636e\u7c7b\u578b [\u7ea6\u675f],<br \/>\n    &#8230;<br \/>\n);<\/p>\n<p>&#8212; \u521b\u5efa\u7d22\u5f15<br \/>\nCREATE INDEX \u7d22\u5f15\u540d ON \u8868\u540d (\u5217\u540d);<\/p>\n<p>&#8212; \u521b\u5efa\u89c6\u56fe<br \/>\nCREATE VIEW \u89c6\u56fe\u540d AS SELECT\u8bed\u53e5; <\/p>\n<ul>\n<li>\u5220\u9664\uff08DROP\uff09\uff1a\u5f7b\u5e95\u5220\u9664\u6570\u636e\u5e93\u53ca\u5176\u6240\u6709\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<p>DROP DATABASE \u6570\u636e\u5e93\u540d;      &#8212; \u5220\u9664\u6570\u636e\u5e93<br \/>\nDROP TABLE \u8868\u540d;            &#8212; \u5220\u9664\u8868<br \/>\nDROP INDEX \u7d22\u5f15\u540d ON \u8868\u540d;   &#8212; \u5220\u9664\u7d22\u5f15<br \/>\nDROP VIEW \u89c6\u56fe\u540d;           &#8212; \u5220\u9664\u89c6\u56fe <\/p>\n<ul>\n<li>\u4fee\u6539\uff08ALTER\uff09\uff1a\u4fee\u6539\u6570\u636e\u5e93\u7684\u7ed3\u6784\u6216\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<p>&#8212; \u4fee\u6539\u8868\u7ed3\u6784<br \/>\nALTER TABLE \u8868\u540d<br \/>\nADD \u5217\u540d \u6570\u636e\u7c7b\u578b;                    &#8212; \u6dfb\u52a0\u5217<br \/>\nDROP COLUMN \u5217\u540d;                    &#8212; \u5220\u9664\u5217<br \/>\nMODIFY COLUMN \u5217\u540d \u65b0\u6570\u636e\u7c7b\u578b;        &#8212; \u4fee\u6539\u5217\u7c7b\u578b<br \/>\nRENAME COLUMN \u65e7\u5217\u540d TO \u65b0\u5217\u540d;       &#8212; \u91cd\u547d\u540d\u5217<br \/>\nADD CONSTRAINT \u7ea6\u675f\u540d \u7ea6\u675f\u7c7b\u578b (\u5217);   &#8212; \u6dfb\u52a0\u7ea6\u675f <\/p>\n<ul>\n<li>\u6e05\u7a7a\uff08TRUNCATE\uff09\uff1a\u6e05\u7a7a\u8868\u3002<\/li>\n<\/ul>\n<p>TRUNCATE TABLE \u8868\u540d; <\/p>\n<ul>\n<li>\u91cd\u547d\u540d\uff08rename\uff09\uff1a\u91cd\u547d\u540d\u8868\u540d\u3002<\/li>\n<\/ul>\n<p>RENAME TABLE \u65e7\u8868\u540d TO \u65b0\u8868\u540d; <\/p>\n<ul>\n<li>\u67e5\u770b\uff08SHOW\uff09\uff1a\u663e\u793a\u6570\u636e\u5e93\u5217\u8868\u6216\u76f8\u5173\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<p>&#8212; \u67e5\u770b\u6240\u6709\u6570\u636e\u5e93<br \/>\nSHOW DATABASES;<br \/>\n&#8212; \u67e5\u770b\u5e93\u4e2d\u6240\u6709\u8868<br \/>\nSHOW TABLES;<br \/>\n&#8212; \u67e5\u770b\u6570\u636e\u5e93\u521b\u5efa\u8bed\u53e5<br \/>\nSHOW CREATE DATABASE \u6570\u636e\u5e93\u540d;<br \/>\n&#8212; \u67e5\u770b\u6570\u636e\u8868\u521b\u5efa\u8bed\u53e5<br \/>\nSHOW CREATE TABLE \u6570\u636e\u8868\u540d; <\/p>\n<ul>\n<li>\u5207\u6362\uff08USE\uff09\uff1a\u5207\u6362\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n<p>USE \u6570\u636e\u5e93\u540d; <\/p>\n<h4>DML\uff08\u6570\u636e\u64cd\u7eb5\u8bed\u8a00\uff09<\/h4>\n<p>\u8d1f\u8d23\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u3001\u5220\u3001\u6539\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\u63d2\u5165\uff08INSERT\uff09\uff1a\u5411\u6570\u636e\u8868\u4e2d\u6dfb\u52a0\u65b0\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n<p>&#8212; \u63d2\u5165\u6307\u5b9a\u5217<br \/>\nINSERT INTO \u8868\u540d (\u52171, \u52172, &#8230;)<br \/>\nVALUES (\u503c1, \u503c2, &#8230;);<\/p>\n<p>&#8212; \u63d2\u5165\u6240\u6709\u5217<br \/>\nINSERT INTO \u8868\u540d<br \/>\nVALUES (\u503c1, \u503c2, &#8230;);<\/p>\n<p>&#8212; \u63d2\u5165\u67e5\u8be2\u7ed3\u679c<br \/>\nINSERT INTO \u8868\u540d (\u52171, \u52172, &#8230;)<br \/>\nSELECT \u52171, \u52172, &#8230; FROM \u5176\u4ed6\u8868; <\/p>\n<ul>\n<li>\u5220\u9664\uff08DELETE\uff09\uff1a\u5220\u9664\u6570\u636e\u8868\u4e2d\u7684\u6307\u5b9a\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n<p>DELETE FROM \u8868\u540d<br \/>\nWHERE \u6761\u4ef6; <\/p>\n<ul>\n<li>\u66f4\u65b0\uff08UPDATE\uff09\uff1a\u4fee\u6539\u6570\u636e\u8868\u4e2d\u5df2\u5b58\u5728\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n<p>UPDATE \u8868\u540d<br \/>\nSET \u52171 = \u503c1,<br \/>\n    \u52172 = \u503c2,<br \/>\n    &#8230;<br \/>\nWHERE \u6761\u4ef6; <\/p>\n<h4>DQL\uff08\u6570\u636e\u67e5\u8be2\u8bed\u8a00\uff09<\/h4>\n<p>\u8d1f\u8d23\u67e5\u8be2\u6570\u636e\uff0c\u4e3b\u8981\u662fSELECT\u8bed\u53e5\u3002<\/p>\n<ul>\n<li>\u67e5\u8be2\uff08SELECT\uff09\uff1a\u4ece\u6570\u636e\u8868\u4e2d\u68c0\u7d22\u6240\u9700\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>&#8212; \u57fa\u672c\u683c\u5f0f<br \/>\nSELECT [DISTINCT] \u52171, \u52172, \u805a\u5408\u51fd\u6570(\u5217)  &#8212; 1. \u9009\u62e9\u5217<br \/>\nFROM \u8868\u540d                              &#8212; 2. \u6570\u636e\u6765\u6e90<br \/>\n[WHERE \u6761\u4ef6]                           &#8212; 3. \u7b5b\u9009\u884c<br \/>\n[GROUP BY \u5206\u7ec4\u5217]                      &#8212; 4. \u5206\u7ec4<br \/>\n[HAVING \u5206\u7ec4\u6761\u4ef6]                      &#8212; 5. \u5206\u7ec4\u540e\u7b5b\u9009<br \/>\n[ORDER BY \u6392\u5e8f\u5217 [ASC|DESC]]           &#8212; 6. \u6392\u5e8f<br \/>\n[LIMIT \u8d77\u59cb\u4f4d\u7f6e, \u884c\u6570];                &#8212; 7. \u9650\u5236\u7ed3\u679c<br \/>\n&#8212; \u57fa\u7840\u67e5\u8be2<br \/>\nSELECT * FROM \u8868\u540d;<br \/>\nSELECT \u52171, \u52172 FROM \u8868\u540d;<\/p>\n<p>&#8212; \u6761\u4ef6\u67e5\u8be2<br \/>\nSELECT * FROM \u8868\u540d WHERE \u6761\u4ef6;<\/p>\n<p>&#8212; \u805a\u5408\u67e5\u8be2<br \/>\nSELECT \u805a\u5408\u51fd\u6570(\u5217) FROM \u8868\u540d;<br \/>\n&#8212; \u5e38\u7528\u805a\u5408\u51fd\u6570\uff1aCOUNT(), SUM(), AVG(), MAX(), MIN()<\/p>\n<p>&#8212; \u5206\u7ec4\u67e5\u8be2<br \/>\nSELECT \u5206\u7ec4\u5217, \u805a\u5408\u51fd\u6570(\u5217)<br \/>\nFROM \u8868\u540d<br \/>\nGROUP BY \u5206\u7ec4\u5217<br \/>\nHAVING \u6761\u4ef6;<\/p>\n<p>&#8212; \u8fde\u63a5\u67e5\u8be2<br \/>\n&#8212; \u5185\u8fde\u63a5<br \/>\nSELECT * FROM \u88681 INNER JOIN \u88682 ON \u8fde\u63a5\u6761\u4ef6;<br \/>\n&#8212; \u5de6\u8fde\u63a5<br \/>\nSELECT * FROM \u88681 LEFT JOIN \u88682 ON \u8fde\u63a5\u6761\u4ef6;<br \/>\n&#8212; \u53f3\u8fde\u63a5<br \/>\nSELECT * FROM \u88681 RIGHT JOIN \u88682 ON \u8fde\u63a5\u6761\u4ef6;<br \/>\n&#8212; \u5168\u5916\u8fde\u63a5\uff08MySQL 8.0+\uff09<br \/>\nSELECT * FROM \u88681 FULL JOIN \u88682 ON \u8fde\u63a5\u6761\u4ef6;<br \/>\n&#8212; \u4ea4\u53c9\u8fde\u63a5<br \/>\nSELECT * FROM \u88681 CROSS JOIN \u88682;<\/p>\n<p>&#8212; \u5b50\u67e5\u8be2<br \/>\nSELECT * FROM \u88681<br \/>\nWHERE \u5217 IN (SELECT \u5217 FROM \u88682);<\/p>\n<p>&#8212; \u8054\u5408\u67e5\u8be2<br \/>\nSELECT \u5217 FROM \u88681<br \/>\nUNION [ALL]<br \/>\nSELECT \u5217 FROM \u88682;<\/p>\n<p>&#8212; \u5206\u9875\u67e5\u8be2<br \/>\nSELECT * FROM \u8868\u540d LIMIT \u504f\u79fb\u91cf, \u884c\u6570;<br \/>\n&#8212; MySQL 8.0+ \u652f\u6301<br \/>\nSELECT * FROM \u8868\u540d LIMIT \u884c\u6570 OFFSET \u504f\u79fb\u91cf;<\/p>\n<p>&#8212; \u7a97\u53e3\u51fd\u6570\u67e5\u8be2<br \/>\nSELECT<br \/>\n    \u5217,<br \/>\n    ROW_NUMBER() OVER (ORDER BY \u6392\u5e8f\u5217) AS \u884c\u53f7,<br \/>\n    RANK() OVER (PARTITION BY \u5206\u7ec4\u5217 ORDER BY \u6392\u5e8f\u5217) AS \u6392\u540d<br \/>\nFROM \u8868\u540d; <\/p>\n<h4>DCL\uff08\u6570\u636e\u63a7\u5236\u8bed\u8a00\uff09<\/h4>\n<p>\u8d1f\u8d23\u6743\u9650\u7ba1\u7406\u548c\u4e8b\u52a1\u63a7\u5236\u3002<\/p>\n<h3>MySQL\u6570\u636e\u7c7b\u578b\uff1a\u9009\u62e9\u6bd4\u52aa\u529b\u66f4\u91cd\u8981<\/h3>\n<h4>1. \u6570\u503c\u7c7b\u578b\uff1a\u7cbe\u6253\u7ec6\u7b97\u7684\u827a\u672f<\/h4>\n<p>\u6574\u6570\u7c7b\u578b\uff1a<\/p>\n<table>\n<tr>\n   \u7c7b\u578b<br \/>\n   \u5b57\u8282<br \/>\n   \u6709\u7b26\u53f7\u8303\u56f4<br \/>\n   \u65e0\u7b26\u53f7\u8303\u56f4<br \/>\n   \u9002\u7528\u573a\u666f<br \/>\n  <\/tr>\n<tbody>\n<tr>\n<td>TINYINT<\/td>\n<td>1<\/td>\n<td>-128~127<\/td>\n<td>0~255<\/td>\n<td>\u5e74\u9f84\u3001\u72b6\u6001\u7801<\/td>\n<\/tr>\n<tr>\n<td>SMALLINT<\/td>\n<td>2<\/td>\n<td>-32768~32767<\/td>\n<td>0~65535<\/td>\n<td>\u7aef\u53e3\u53f7\u3001\u5c0f\u8ba1\u6570\u503c<\/td>\n<\/tr>\n<tr>\n<td>MEDIUMINT<\/td>\n<td>3<\/td>\n<td>-838\u4e07~838\u4e07<\/td>\n<td>0~1677\u4e07<\/td>\n<td>\u7528\u6237ID\u3001\u6587\u7ae0\u6570<\/td>\n<\/tr>\n<tr>\n<td>INT<\/td>\n<td>4<\/td>\n<td>-21\u4ebf~21\u4ebf<\/td>\n<td>0~42\u4ebf<\/td>\n<td>\u5927\u7528\u6237\u91cfID\u3001\u8ba2\u5355\u6570<\/td>\n<\/tr>\n<tr>\n<td>BIGINT<\/td>\n<td>8<\/td>\n<td>-922\u4ebf\u4ebf~922\u4ebf\u4ebf<\/td>\n<td>0~1844\u4ebf\u4ebf<\/td>\n<td>\u91d1\u878d\u91d1\u989d\u3001\u6d77\u91cf\u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6d6e\u70b9\u6570\u7c7b\u578b\uff1a<\/p>\n<table>\n<tr>\n   \u7c7b\u578b<br \/>\n   \u5b57\u8282<br \/>\n   \u9002\u7528\u573a\u666f<br \/>\n  <\/tr>\n<tbody>\n<tr>\n<td>FLOAT<\/td>\n<td>4<\/td>\n<td>\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u7cbe\u5ea6\u7ea67\u4f4d\u5c0f\u6570\uff0c\u9002\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\u3001\u6d4b\u91cf\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>DOUBLE<\/td>\n<td>8<\/td>\n<td>\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u7cbe\u5ea6\u7ea615\u4f4d\u5c0f\u6570\uff0c\u9002\u7528\u4e8e\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u3001\u5de5\u7a0b\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td>DECIMAL(M,D)<\/td>\n<td>\u53d8\u957f<\/td>\n<td>\u7cbe\u786e\u5c0f\u6570\uff0c\u9002\u7528\u4e8e\u91d1\u878d\u91d1\u989d\u3001\u9700\u8981\u7cbe\u786e\u8ba1\u7b97\u7684\u573a\u666f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u5b57\u7b26\u4e32\u7c7b\u578b\uff1a\u7a7a\u95f4\u4e0e\u6027\u80fd\u7684\u5e73\u8861<\/h4>\n<table>\n<tr>\n   \u7c7b\u578b<br \/>\n   \u6700\u5927\u957f\u5ea6<br \/>\n   \u5b58\u50a8\u7279\u70b9<br \/>\n   \u9002\u7528\u573a\u666f<br \/>\n  <\/tr>\n<tbody>\n<tr>\n<td>CHAR(n)<\/td>\n<td>255\u5b57\u7b26<\/td>\n<td>\u56fa\u5b9a\u957f\u5ea6\uff0c\u7a7a\u683c\u586b\u5145<\/td>\n<td>\u6027\u522b\u3001\u72b6\u6001\u7801\u3001MD5\u54c8\u5e0c<\/td>\n<\/tr>\n<tr>\n<td>VARCHAR(n)<\/td>\n<td>65535\u5b57\u8282<\/td>\n<td>\u53ef\u53d8\u957f\u5ea6\uff0c1-2\u5b57\u8282\u957f\u5ea6\u524d\u7f00<\/td>\n<td>\u7528\u6237\u540d\u3001\u5730\u5740\u3001\u90ae\u7bb1<\/td>\n<\/tr>\n<tr>\n<td>TINYTEXT<\/td>\n<td>255\u5b57\u8282<\/td>\n<td>\u53ef\u53d8\u957f\u5ea6\uff0c\u6548\u7387\u7a0d\u4f4e<\/td>\n<td>\u77ed\u63cf\u8ff0\u3001\u5907\u6ce8<\/td>\n<\/tr>\n<tr>\n<td>TEXT<\/td>\n<td>65KB<\/td>\n<td>\u53ef\u53d8\u957f\u5ea6\uff0c\u989d\u5916\u5b58\u50a8<\/td>\n<td>\u6587\u7ae0\u5185\u5bb9\u3001\u8bc4\u8bba<\/td>\n<\/tr>\n<tr>\n<td>MEDIUMTEXT<\/td>\n<td>16MB<\/td>\n<td>\u5927\u6587\u672c\u5b58\u50a8<\/td>\n<td>\u957f\u6587\u7ae0\u3001\u65e5\u5fd7<\/td>\n<\/tr>\n<tr>\n<td>LONGTEXT<\/td>\n<td>4GB<\/td>\n<td>\u8d85\u5927\u6587\u672c<\/td>\n<td>\u4e66\u7c4d\u3001\u8be6\u7ec6\u62a5\u544a<\/td>\n<\/tr>\n<tr>\n<td>ENUM<\/td>\n<td>65535\u4e2a\u503c<\/td>\n<td>\u5185\u90e8\u7528\u6574\u6570\u5b58\u50a8<\/td>\n<td>\u6709\u9650\u9009\u9879\u5982\u72b6\u6001\u3001\u7c7b\u578b<\/td>\n<\/tr>\n<tr>\n<td>SET<\/td>\n<td>64\u4e2a\u6210\u5458<\/td>\n<td>\u4f4d\u56fe\u5b58\u50a8\u591a\u9009\u9879<\/td>\n<td>\u6807\u7b7e\u3001\u591a\u9009\u9879<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u65e5\u671f\u65f6\u95f4\u7c7b\u578b\uff1a\u65f6\u95f4\u5c31\u662f\u4e00\u5207<\/h4>\n<table>\n<tr>\n   \u7c7b\u578b<br \/>\n   \u683c\u5f0f<br \/>\n   \u8303\u56f4<br \/>\n   \u5b58\u50a8\u7a7a\u95f4<br \/>\n   \u9002\u7528\u573a\u666f<br \/>\n  <\/tr>\n<tbody>\n<tr>\n<td>DATE<\/td>\n<td style=\"width:163px\">YYYY-MM-DD<\/td>\n<td style=\"width:192px\">1000-01-01 ~ 9999-12-31<\/td>\n<td style=\"width:75px\">3\u5b57\u8282<\/td>\n<td style=\"width:161px\">\u751f\u65e5\u3001\u4e8b\u4ef6\u65e5\u671f<\/td>\n<\/tr>\n<tr>\n<td>TIME<\/td>\n<td style=\"width:163px\">HH:MM:SS[.\u5fae\u79d2]<\/td>\n<td style=\"width:192px\">-838:59:59 ~ 838:59:59<\/td>\n<td style=\"width:75px\">3\u5b57\u8282<\/td>\n<td style=\"width:161px\">\u6301\u7eed\u65f6\u95f4\u3001\u65f6\u95f4\u95f4\u9694<\/td>\n<\/tr>\n<tr>\n<td>DATETIME<\/td>\n<td style=\"width:163px\">YYYY-MM-DD HH:MM:SS[.\u5fae\u79d2]<\/td>\n<td style=\"width:192px\">1000-01-01 00:00:00 ~ 9999-12-31 23:59:59<\/td>\n<td style=\"width:75px\">8\u5b57\u8282<\/td>\n<td style=\"width:161px\">\u8ba2\u5355\u65f6\u95f4\u3001\u65e5\u5fd7\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>TIMESTAMP<\/td>\n<td style=\"width:163px\">YYYY-MM-DD HH:MM:SS[.\u5fae\u79d2]<\/td>\n<td style=\"width:192px\">1970-01-01 00:00:01 ~ 2038-01-19 03:14:07<\/td>\n<td style=\"width:75px\">4\u5b57\u8282<\/td>\n<td style=\"width:161px\">\u81ea\u52a8\u65f6\u95f4\u6233\u3001\u7248\u672c\u63a7\u5236<\/td>\n<\/tr>\n<tr>\n<td>YEAR<\/td>\n<td style=\"width:163px\">YYYY<\/td>\n<td style=\"width:192px\">1901 ~ 2155<\/td>\n<td style=\"width:75px\">1\u5b57\u8282<\/td>\n<td style=\"width:161px\">\u6bd5\u4e1a\u5e74\u4efd\u3001\u6210\u7acb\u5e74\u4efd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4. 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