{"id":117229,"date":"2026-10-22T22:48:43","date_gmt":"2026-10-22T14:48:43","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/117229.html"},"modified":"2026-10-22T22:48:43","modified_gmt":"2026-10-22T14:48:43","slug":"%e6%96%b0%e6%89%8b%e5%8b%87%e9%97%af%e7%bd%91%e7%bb%9c%e5%ae%89%e5%85%a8-mysql%e5%9f%ba%e7%a1%80%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/117229.html","title":{"rendered":"\u65b0\u624b\u52c7\u95ef\u7f51\u7edc\u5b89\u5168 | MySQL\u57fa\u7840\uff08\u4e00\uff09"},"content":{"rendered":"

\u5b66\u5b8c Python \u81ea\u52a8\u5316，\u6211\u4eec\u8fdb\u5165\u6570\u636e\u5e93\u5b89\u5168\u65b9\u5411\u3002SQL \u6ce8\u5165\u662f Web \u5b89\u5168\u4e2d\u6700\u7ecf\u5178\u7684\u6f0f\u6d1e，\u800c\u7406\u89e3 SQL \u6ce8\u5165\u7684\u524d\u63d0，\u662f\u5148\u638c\u63e1\u6570\u636e\u5e93\u672c\u8eab\u3002\u8fd9\u4e00\u7bc7\u4ece MySQL \u57fa\u7840\u5f00\u59cb：\u6570\u636e\u5e93\u4e0e DBMS \u7684\u6982\u5ff5\u3001\u8868\/\u8bb0\u5f55\/\u5b57\u6bb5\u7b49\u57fa\u7840\u5bf9\u8c61\u3001\u547d\u4ee4\u884c\u8fde\u63a5\u3001SQL \u56db\u5927\u5206\u7c7b\u3001CRUD \u589e\u5220\u6539\u67e5\u548c UNION \u8054\u5408\u67e5\u8be2\u3002\u638c\u63e1\u8fd9\u4e9b\u67e5\u8be2\u80fd\u529b，\u540e\u7eed\u7406\u89e3\u6ce8\u5165\u539f\u7406\u548c\u6570\u636e\u679a\u4e3e\u5c31\u662f\u6c34\u5230\u6e20\u6210\u7684\u4e8b\u3002<\/p>\n

\n

\u4e00\u3001\u6570\u636e\u5e93\u57fa\u672c\u6982\u5ff5<\/h3>\n

1.1 \u4ec0\u4e48\u662f\u6570\u636e\u5e93<\/h4>\n

\u6570\u636e\u5e93（Database）\u662f\u6309\u7167\u4e00\u5b9a\u7ed3\u6784\u7ec4\u7ec7\u3001\u5b58\u50a8\u548c\u7ba1\u7406\u6570\u636e\u7684\u96c6\u5408，\u7528\u4e8e\u9ad8\u6548\u4fdd\u5b58\u3001\u67e5\u8be2\u3001\u4fee\u6539\u548c\u7ef4\u62a4\u5927\u91cf\u6570\u636e\u3002\u53ef\u4ee5\u5f62\u8c61\u5730\u6bd4\u55bb\u4e3a\u4e00\u5ea7\u5927\u578b\u56fe\u4e66\u9986：\u4e66\u7c4d\u662f\u6570\u636e\u8bb0\u5f55，\u5206\u7c7b\u7f16\u53f7\u662f\u7d22\u5f15，\u56fe\u4e66\u7ba1\u7406\u5458\u5c31\u662f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf（DBMS）\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u9700\u8981\u6570\u636e\u5e93：\u4e0e Excel \u6216\u6587\u672c\u6587\u4ef6\u76f8\u6bd4，\u6570\u636e\u5e93\u66f4\u9002\u5408\u5b58\u50a8\u5927\u91cf\u6570\u636e\u3001\u591a\u4eba\u540c\u65f6\u8bbf\u95ee\u3001\u6309\u6761\u4ef6\u5feb\u901f\u68c0\u7d22\u3001\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027，\u4ee5\u53ca\u8fdb\u884c\u6743\u9650\u7ba1\u7406\u548c\u5ba1\u8ba1\u3002<\/p>\n

1.2 \u4ec0\u4e48\u662f DBMS\u3010\u91cd\u70b9\u3011<\/h4>\n

\u6570\u636e\u5e93\u672c\u8eab\u53ea\u662f\u6570\u636e\u7684\u96c6\u5408，\u800c\u771f\u6b63\u8d1f\u8d23"\u521b\u5efa\u6570\u636e\u5e93\u3001\u7ba1\u7406\u7528\u6237\u3001\u6267\u884c SQL\u3001\u63a7\u5236\u6743\u9650\u3001\u5b58\u50a8\u6570\u636e\u3001\u8fd4\u56de\u67e5\u8be2\u7ed3\u679c"\u7684\u8f6f\u4ef6，\u53eb\u505a DBMS（Database Management System，\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf）\u3002<\/p>\n

\u6ca1\u6709 DBMS，\u5c31\u65e0\u6cd5\u5b8c\u6210：\u521b\u5efa\u5e93\u8868\u3001\u8bfb\u5199\u6570\u636e\u3001\u6743\u9650\u7ba1\u63a7\u3001\u4e8b\u52a1\u5e76\u53d1\u3001\u5907\u4efd\u6062\u590d\u3002<\/p>\n

1.3 \u5e38\u89c1 DBMS<\/h4>\n\nDBMS\u7279\u70b9\u5e38\u89c1\u573a\u666f<\/tr>\n\n\n\n\n\n\n
MySQL<\/td>\n\u5f00\u6e90\u3001\u514d\u8d39\u3001\u8f7b\u91cf\u3001\u8d44\u6599\u591a\u3001\u4e0a\u624b\u5feb<\/td>\n\u7f51\u7ad9\u3001CMS\u3001\u6559\u52a1\u7cfb\u7edf\u3001\u8bba\u575b\u3001\u7535\u5546<\/td>\n<\/tr>\n
SQL Server \/ MSSQL<\/td>\n\u5fae\u8f6f\u5f00\u53d1，\u4e0e\u5fae\u8f6f\u751f\u6001\u6df1\u5ea6\u96c6\u6210<\/td>\nWindows \u751f\u6001\u3001\u90e8\u5206\u653f\u4f01\u5185\u7f51\u7cfb\u7edf<\/td>\n<\/tr>\n
Oracle<\/td>\n\u529f\u80fd\u5f3a\u3001\u4f53\u7cfb\u91cd\u3001\u8fd0\u7ef4\u6210\u672c\u9ad8<\/td>\n\u94f6\u884c\u3001\u8fd0\u8425\u5546\u3001\u5927\u578b\u4f20\u7edf\u4f01\u4e1a<\/td>\n<\/tr>\n
PostgreSQL<\/td>\n\u5f00\u6e90\u80fd\u529b\u5f3a\u3001\u6807\u51c6\u517c\u5bb9\u6027\u597d<\/td>\n\u4e2d\u5927\u578b\u4e1a\u52a1\u3001GIS\u3001\u6570\u636e\u5e73\u53f0<\/td>\n<\/tr>\n
SQLite<\/td>\n\u8f7b\u91cf\u7ea7\u5d4c\u5165\u5f0f\u6570\u636e\u5e93，\u65e0\u9700\u72ec\u7acb\u670d\u52a1<\/td>\n\u5355\u673a\u7a0b\u5e8f\u3001\u79fb\u52a8\u7aef\u3001\u672c\u5730\u7f13\u5b58<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u56fd\u4ea7\u6570\u636e\u5e93：\u8fbe\u68a6（DM）\u3001OceanBase\u3001PolarDB\u3001TiDB\u3001GaussDB\u3001\u4eba\u5927\u91d1\u4ed3\u7b49，\u5e38\u89c1\u4e8e\u653f\u4f01\u3001\u4fe1\u521b\u66ff\u4ee3\u3001\u91d1\u878d\u7ea7\u4e1a\u52a1\u7b49\u573a\u666f\u3002<\/p>\n

\u672c\u8bfe\u53ea\u5b66\u4e60\u5173\u7cfb\u578b\u6570\u636e\u5e93，\u975e\u5173\u7cfb\u578b（Redis\u3001MongoDB）\u4e0d\u6d89\u53ca\u3002<\/p>\n

1.4 \u4e3a\u4ec0\u4e48\u7528 MySQL<\/h4>\n
  • \u4f7f\u7528\u8303\u56f4\u5e7f，\u4e2d\u5c0f\u578b Web \u5e94\u7528\u3001\u9776\u573a\u5168\u8986\u76d6<\/li>\n
  • \u4e0a\u624b\u95e8\u69db\u4f4e，phpStudy \u4e00\u952e\u90e8\u7f72<\/li>\n
  • information_schema \u5143\u6570\u636e\u7ed3\u6784\u6e05\u6670，\u9002\u5408\u6570\u636e\u5e93\u7ed3\u6784\u679a\u4e3e\u6559\u5b66<\/li>\n

    MySQL \u4e0d\u662f\u552f\u4e00\u9700\u8981\u638c\u63e1\u7684\u6570\u636e\u5e93，\u4f46\u662f\u6570\u636e\u5e93\u5b89\u5168\u5b66\u4e60\u7684\u6700\u4f18\u5165\u95e8\u6570\u636e\u5e93\u3002<\/p>\n

    \n

    \u4e8c\u3001\u6570\u636e\u5e93\u57fa\u7840\u5bf9\u8c61\u3010\u91cd\u70b9\u3011<\/h3>\n\n\u5bf9\u8c61\u8bf4\u660e\u4e00\u53e5\u8bdd\u7406\u89e3<\/tr>\n\n\n\n\n\n\n\n
    \u8868（Table）<\/td>\n\u7531\u884c\u548c\u5217\u7ec4\u6210\u7684\u4e8c\u7ef4\u7ed3\u6784，\u7528\u4e8e\u5b58\u50a8\u7ed3\u6784\u5316\u6570\u636e<\/td>\n\u540c\u7c7b\u6570\u636e\u7684\u5b58\u50a8\u7ed3\u6784<\/td>\n<\/tr>\n
    \u8bb0\u5f55（Record\/Row）<\/td>\n\u8868\u683c\u4e2d\u7684\u6bcf\u4e00\u884c，\u4ee3\u8868\u4e00\u4e2a\u72ec\u7acb\u7684\u6570\u636e\u5b9e\u4f8b<\/td>\n\u8868\u5185\u5355\u884c\u6570\u636e<\/td>\n<\/tr>\n
    \u5b57\u6bb5（Field\/Column）<\/td>\n\u8868\u683c\u4e2d\u7684\u6bcf\u4e00\u5217，\u5b9a\u4e49\u6570\u636e\u7684\u5c5e\u6027\u7c7b\u578b<\/td>\n\u8868\u5185\u5355\u5217\u5c5e\u6027<\/td>\n<\/tr>\n
    \u4e3b\u952e（Primary Key）<\/td>\n\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u6bcf\u4e00\u6761\u8bb0\u5f55，\u5fc5\u987b\u552f\u4e00\u4e14\u4e0d\u53ef\u4e3a\u7a7a<\/td>\n\u5b9a\u4f4d\u5355\u884c<\/td>\n<\/tr>\n
    \u5916\u952e（Foreign Key）<\/td>\n\u5efa\u7acb\u5e76\u5f3a\u5236\u4e24\u4e2a\u8868\u4e4b\u95f4\u94fe\u63a5\u7684\u5b57\u6bb5<\/td>\n\u591a\u8868\u5173\u8054\u7ebd\u5e26<\/td>\n<\/tr>\n
    \u7d22\u5f15（Index）<\/td>\n\u52a0\u901f\u67e5\u8be2\u7684\u7279\u6b8a\u6570\u636e\u7ed3\u6784，\u7c7b\u4f3c\u4e66\u7c4d\u76ee\u5f55<\/td>\n\u63d0\u901f\u67e5\u8be2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e3b\u952e\u4e0d\u80fd\u91cd\u590d\u3001\u4e0d\u80fd\u4e3a NULL；\u5916\u952e\u5982 students.class_id \u5173\u8054 classes.class_id；\u7d22\u5f15\u4e0d\u6539\u53d8\u539f\u59cb\u6570\u636e\u3002\u4e09\u8005\u6838\u5fc3\u4f5c\u7528：\u4e3b\u952e=\u5b9a\u4f4d\u5355\u884c\u3001\u5916\u952e=\u8868\u5173\u8054\u3001\u7d22\u5f15=\u63d0\u901f\u67e5\u8be2\u3002<\/p>\n

    \n

    \u4e09\u3001\u73af\u5883\u642d\u5efa\u4e0e\u8fde\u63a5 MySQL<\/h3>\n

    3.1 \u6d4b\u8bd5\u73af\u5883<\/h4>\n
      \n
    • \u96c6\u6210\u73af\u5883：phpStudy \u4e2d\u7684 MySQL 5.7<\/li>\n
    • \u8fde\u63a5\u65b9\u5f0f：Navicat + mysql \u547d\u4ee4\u884c<\/li>\n
    • MySQL \u9ed8\u8ba4\u7aef\u53e3：3306<\/li>\n
    • \u9ed8\u8ba4\u7ba1\u7406\u5458\u8d26\u53f7：root<\/li>\n<\/ul>\n

      \u672c\u8bfe\u4ee5 MySQL 5.7 \u4e3a\u51c6，\u4e2a\u522b\u51fd\u6570\u548c\u7cfb\u7edf\u8868\u5728 MySQL 8.0 \u4e2d\u5b58\u5728\u5dee\u5f02（8.0 \u79fb\u9664 password \u5b57\u6bb5\u3001information_schema \u90e8\u5206\u8868\u5b57\u6bb5\u53d8\u66f4），\u540e\u7eed\u6ce8\u5165\u9776\u573a\u4f18\u5148\u9009\u7528 5.7\u3002<\/p>\n

      3.2 \u56fe\u5f62\u5316\u8fde\u63a5\u5de5\u5177<\/h4>\n

      Navicat \u662f\u6700\u6d41\u884c\u7684\u5546\u4e1a\u6570\u636e\u5e93\u7ba1\u7406\u5de5\u5177\u4e4b\u4e00\u3002\u6838\u5fc3\u539f\u7406：\u6240\u6709\u56fe\u5f62\u5316\u70b9\u51fb\u64cd\u4f5c，\u5e95\u5c42\u90fd\u4f1a\u8f6c\u5316\u4e3a\u539f\u751f SQL \u8bed\u53e5\u3010\u91cd\u70b9\u3011\u3002<\/p>\n

      3.3 \u547d\u4ee4\u884c\u8fde\u63a5\u3010\u5b9e\u64cd\u5fc5\u8003\u3011<\/h4>\n

      # \u8fde\u63a5\u672c\u5730 MySQL，\u9ed8\u8ba4\u7aef\u53e3 3306<\/span>
      \nmysql -u<\/span> root -p<\/span><\/p>\n

      # \u8fde\u63a5\u6307\u5b9a IP \u548c\u7aef\u53e3<\/span>
      \nmysql -h<\/span> 127.0<\/span>.0.1 -P<\/span> 3306<\/span> -u<\/span> root -p<\/span><\/p>\n

      \u6613\u9519\u5751：\u7aef\u53e3\u53c2\u6570\u662f\u5927\u5199 -P，\u5c0f\u5199 -p \u4ee3\u8868\u5bc6\u7801\u3002<\/p>\n

      \u82e5\u63d0\u793a"mysql \u4e0d\u662f\u5185\u90e8\u547d\u4ee4"，\u9700\u5c06 phpStudy \u7684 mysql\/bin \u76ee\u5f55\u52a0\u5165\u7cfb\u7edf\u73af\u5883\u53d8\u91cf PATH\u3002<\/p>\n

      3.4 \u8fde\u63a5\u540e\u9ad8\u9891\u5185\u7f6e\u547d\u4ee4<\/h4>\n

      — \u67e5\u770b\u5f53\u524d MySQL \u670d\u52a1\u5668\u4e0a\u6240\u6709\u7684\u6570\u636e\u5e93<\/span>
      \nSHOW<\/span> DATABASES<\/span>;<\/span><\/p>\n

      — \u5207\u6362\u5230\u540d\u4e3a mysql \u7684\u6570\u636e\u5e93<\/span>
      \nUSE<\/span> mysql;<\/span><\/p>\n

      — \u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u91cc\u6240\u6709\u7684\u8868<\/span>
      \nSHOW<\/span> TABLES<\/span>;<\/span><\/p>\n

      — \u67e5\u770b\u5f53\u524d\u6b63\u5728\u4f7f\u7528\u54ea\u4e2a\u6570\u636e\u5e93<\/span>
      \nSELECT<\/span> DATABASE<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

      — \u9000\u51fa MySQL \u547d\u4ee4\u884c<\/span>
      \nEXIT<\/span>;<\/span><\/p>\n

      3.5 \u6613\u9519\u70b9<\/h4>\n
    • SQL \u8bed\u53e5\u5fc5\u987b\u4ee5\u82f1\u6587\u5206\u53f7 ; \u7ed3\u5c3e，\u4e0d\u52a0\u5206\u53f7\u4f1a\u8fdb\u5165\u591a\u884c\u7b49\u5f85\u6a21\u5f0f<\/li>\n
    • mysql -p \u540e\u7981\u6b62\u52a0\u7a7a\u683c\u548c\u660e\u6587\u5bc6\u7801，\u4f1a\u62a5\u9519\u4e14\u660e\u6587\u7559\u5b58\u65e5\u5fd7<\/li>\n
    • \u547d\u4ee4\u884c\u5bc6\u7801\u8f93\u5165\u65e0\u56de\u663e，\u5c5e\u4e8e\u6b63\u5e38\u5b89\u5168\u673a\u5236，\u4e0d\u662f\u8f93\u5165\u6545\u969c<\/li>\n
      \n

      \u56db\u3001SQL \u57fa\u7840<\/h3>\n

      4.1 SQL \u662f\u4ec0\u4e48<\/h4>\n

      SQL（Structured Query Language，\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00）\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\u901a\u7528\u7684\u4ea4\u4e92\u6807\u51c6，\u6240\u6709\u6570\u636e\u5e93\u4ea4\u4e92\u884c\u4e3a\u90fd\u4f9d\u9760 SQL\u3002\u5b83\u662f\u4eba\u4e0e\u6570\u636e\u5e93\u4ea4\u4e92\u7684"\u901a\u7528\u94a5\u5319"\u3002<\/p>\n

      \u7f51\u5b89\u5e95\u5c42\u903b\u8f91：\u6240\u6709 SQL \u6ce8\u5165\u6f0f\u6d1e，\u672c\u8d28\u90fd\u662f\u53ef\u63a7\u7528\u6237\u8f93\u5165\u62fc\u63a5\u7be1\u6539\u4e86\u539f\u751f SQL \u8bed\u53e5\u3002\u56fe\u5f62\u5316\u5de5\u5177\u5e95\u5c42\u6267\u884c\u903b\u8f91\u4ecd\u662f SQL \u8bed\u53e5\u3002<\/p>\n

      4.2 SQL \u56db\u5927\u5206\u7c7b<\/h4>\n\n\u5206\u7c7b\u5168\u79f0\u5173\u952e\u5b57\u4f5c\u7528<\/tr>\n\n\n\n\n\n
      DDL<\/td>\n\u6570\u636e\u5b9a\u4e49\u8bed\u8a00<\/td>\nCREATE\u3001ALTER\u3001DROP<\/td>\n\u64cd\u4f5c\u5e93\u8868\u7ed3\u6784，\u4e0d\u64cd\u4f5c\u6570\u636e<\/td>\n<\/tr>\n
      DML<\/td>\n\u6570\u636e\u64cd\u4f5c\u8bed\u8a00<\/td>\nINSERT\u3001UPDATE\u3001DELETE<\/td>\n\u64cd\u4f5c\u8868\u5185\u5355\u884c\u6570\u636e<\/td>\n<\/tr>\n
      DQL<\/td>\n\u6570\u636e\u67e5\u8be2\u8bed\u8a00<\/td>\nSELECT<\/td>\n\u6570\u636e\u7b5b\u9009\u8bfb\u53d6，\u6ce8\u5165\u4f7f\u7528\u9891\u7387\u6700\u9ad8<\/td>\n<\/tr>\n
      DCL<\/td>\n\u6570\u636e\u63a7\u5236\u8bed\u8a00<\/td>\nGRANT\u3001REVOKE<\/td>\n\u6743\u9650\u7ba1\u63a7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u8bb0\u5fc6\u53e3\u8bc0：DDL \u6539\u7ed3\u6784\u3001DML \u6539\u6570\u636e\u3001DQL \u67e5\u6570\u636e\u3001DCL \u63a7\u6743\u9650\u3002<\/p>\n

      \n

      \u4e94\u3001DDL：\u5e93\u8868\u7ed3\u6784\u64cd\u4f5c<\/h3>\n

      5.1 \u521b\u5efa\u6570\u636e\u5e93\u4e0e\u8868<\/h4>\n

      — \u521b\u5efa\u6570\u636e\u5e93（\u4e0d\u5b58\u5728\u624d\u521b\u5efa，\u6307\u5b9a\u5b57\u7b26\u96c6）<\/span>
      \nCREATE<\/span> DATABASE<\/span> IF<\/span> NOT<\/span> EXISTS<\/span> school CHARACTER<\/span> SET<\/span> utf8 COLLATE<\/span> utf8_general_ci;<\/span><\/p>\n

      — \u4f7f\u7528\u6570\u636e\u5e93<\/span>
      \nUSE<\/span> school;<\/span><\/p>\n

      — \u521b\u5efa\u6570\u636e\u8868：\u4e3b\u952e\u81ea\u589e + \u5b57\u7b26\u4e32\u5b57\u6bb5<\/span>
      \nCREATE<\/span> TABLE<\/span> students (<\/span>
      \n student_id INT<\/span> PRIMARY<\/span> KEY<\/span> AUTO_INCREMENT<\/span>,<\/span>
      \n username VARCHAR<\/span>(<\/span>50<\/span>)<\/span> NOT<\/span> NULL<\/span>,<\/span>
      \n real_name VARCHAR<\/span>(<\/span>50<\/span>)<\/span> NOT<\/span> NULL<\/span>,<\/span>
      \n age INT<\/span> NOT<\/span> NULL<\/span>
      \n)<\/span>;<\/span><\/p>\n

      \u6838\u5fc3\u77e5\u8bc6\u70b9：<\/p>\n

        \n
      • PRIMARY KEY（\u4e3b\u952e）：\u552f\u4e00\u6807\u8bc6\u884c\u6570\u636e，\u786e\u4fdd\u65e0\u91cd\u590d\u4e14\u975e\u7a7a<\/li>\n
      • AUTO_INCREMENT（\u81ea\u589e）：\u81ea\u52a8\u5206\u914d\u552f\u4e00\u6570\u5b57 ID，\u65e0\u9700\u624b\u52a8\u8f93\u5165<\/li>\n
      • VARCHAR(50)：\u5b57\u7b26\u4e32\u7c7b\u578b，\u6700\u591a\u5bb9\u7eb3 50 \u4e2a\u5b57\u7b26<\/li>\n
      • NOT NULL：\u8be5\u5b57\u6bb5\u4e0d\u5141\u8bb8\u4e3a\u7a7a<\/li>\n<\/ul>\n

        5.2 \u5220\u9664\u8868\u4e0e\u6570\u636e\u5e93<\/h4>\n

        — \u5220\u9664\u6570\u636e\u8868<\/span>
        \nDROP<\/span> TABLE<\/span> IF<\/span> EXISTS<\/span> students;<\/span><\/p>\n

        — \u5220\u9664\u6570\u636e\u5e93<\/span>
        \nDROP<\/span> DATABASE<\/span> IF<\/span> EXISTS<\/span> school;<\/span><\/p>\n

        CREATE \u7528\u4e8e\u521b\u5efa\u5bf9\u8c61，DROP \u7528\u4e8e\u5220\u9664\u5bf9\u8c61\u3002\u8fd9\u4e9b\u8bed\u53e5\u64cd\u4f5c\u7684\u662f"\u6570\u636e\u5e93\u5bf9\u8c61"，\u4e0d\u662f\u8868\u4e2d\u7684\u5177\u4f53\u67d0\u4e00\u884c\u6570\u636e\u3002<\/p>\n

        \n

        \u516d\u3001DML：\u6570\u636e\u589e\u5220\u6539<\/h3>\n

        6.1 INSERT \u6570\u636e\u65b0\u589e<\/h4>\n

        — \u5355\u6761\u63d2\u5165：\u5b57\u6bb5\u987a\u5e8f\u3001\u503c\u987a\u5e8f\u4e00\u4e00\u5bf9\u5e94<\/span>
        \nINSERT<\/span> INTO<\/span> students(<\/span>username,<\/span> real_name,<\/span> gender,<\/span> age,<\/span> phone,<\/span> class_id)<\/span>
        \nVALUES<\/span>(<\/span>'sunqi'<\/span>,<\/span> '\u5b59\u4e03'<\/span>,<\/span> '\u7537'<\/span>,<\/span> 20<\/span>,<\/span> '13800000005'<\/span>,<\/span> 2<\/span>)<\/span>;<\/span><\/p>\n

        — \u6279\u91cf\u63d2\u5165<\/span>
        \nINSERT<\/span> INTO<\/span> students(<\/span>username,<\/span> real_name,<\/span> gender,<\/span> age,<\/span> phone,<\/span> class_id)<\/span>
        \nVALUES<\/span>
        \n(<\/span>'zhouba'<\/span>,<\/span> '\u5468\u516b'<\/span>,<\/span> '\u5973'<\/span>,<\/span> 19<\/span>,<\/span> '13800000006'<\/span>,<\/span> 1<\/span>)<\/span>,<\/span>
        \n(<\/span>'wujiu'<\/span>,<\/span> '\u5434\u4e5d'<\/span>,<\/span> '\u7537'<\/span>,<\/span> 22<\/span>,<\/span> '13800000007'<\/span>,<\/span> 3<\/span>)<\/span>;<\/span><\/p>\n

        \u6ce8\u610f\u4e8b\u9879：\u5b57\u6bb5\u4e0e\u503c\u7684\u987a\u5e8f\u548c\u6570\u91cf\u5fc5\u987b\u4e00\u4e00\u5bf9\u5e94；\u5b57\u7b26\u4e32\u503c\u9700\u7528\u5355\u5f15\u53f7 ' \u5305\u88f9，\u6570\u503c\u5219\u65e0\u9700\u3002<\/p>\n

        6.2 UPDATE \u6570\u636e\u4fee\u6539<\/h4>\n

        UPDATE<\/span> students
        \nSET<\/span> phone =<\/span> '13900000001'<\/span>
        \nWHERE<\/span> student_id =<\/span> 1<\/span>;<\/span><\/p>\n

        \u91cd\u8981\u77e5\u8bc6\u70b9：UPDATE \u5fc5\u987b\u914d\u5408 WHERE \u4f7f\u7528；\u6ca1\u6709 WHERE \u4f1a\u4fee\u6539\u6574\u5f20\u8868\u7684\u6570\u636e，\u5bfc\u81f4\u4e25\u91cd\u540e\u679c！<\/p>\n

        6.3 DELETE \u6570\u636e\u5220\u9664<\/h4>\n

        DELETE<\/span> FROM<\/span> students WHERE<\/span> student_id =<\/span> 4<\/span>;<\/span><\/p>\n

        \u91cd\u8981\u77e5\u8bc6\u70b9：DELETE \u4e5f\u5efa\u8bae\u59cb\u7ec8\u914d\u5408 WHERE；\u6ca1\u6709 WHERE \u4f1a\u5220\u9664\u6574\u5f20\u8868\u7684\u6240\u6709\u8bb0\u5f55\u4e14\u4e0d\u53ef\u64a4\u56de\u3002<\/p>\n

        \n

        \u4e03\u3001DQL：\u6570\u636e\u67e5\u8be2\u3010\u91cd\u70b9\u3011<\/h3>\n

        SELECT \u662f\u6700\u6838\u5fc3\u7684\u67e5\u8be2\u8bed\u53e5，\u540e\u7eed\u5927\u90e8\u5206\u4fe1\u606f\u83b7\u53d6\u548c\u679a\u4e3e\u52a8\u4f5c，\u672c\u8d28\u4e0a\u90fd\u4f9d\u8d56\u67e5\u8be2\u80fd\u529b\u3002<\/p>\n

        7.1 \u57fa\u672c\u67e5\u8be2<\/h4>\n

        — \u67e5\u8be2\u5168\u90e8\u5b57\u6bb5<\/span>
        \nSELECT<\/span> *<\/span> FROM<\/span> students;<\/span><\/p>\n

        — \u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5<\/span>
        \nSELECT<\/span> username,<\/span> real_name,<\/span> phone FROM<\/span> students;<\/span><\/p>\n

        — \u53bb\u91cd\u67e5\u8be2：\u8fc7\u6ee4\u91cd\u590d\u7684\u73ed\u7ea7 ID<\/span>
        \nSELECT<\/span> DISTINCT<\/span> class_id FROM<\/span> students;<\/span><\/p>\n

        7.2 \u6392\u5e8f\u67e5\u8be2<\/h4>\n

        — \u6309\u5e74\u9f84\u964d\u5e8f\u6392\u5217（DESC \u964d\u5e8f，ASC \u5347\u5e8f\u4e3a\u9ed8\u8ba4）<\/span>
        \nSELECT<\/span> *<\/span> FROM<\/span> students ORDER<\/span> BY<\/span> age DESC<\/span>;<\/span><\/p>\n

        7.3 \u9650\u5236\u6570\u91cf<\/h4>\n

        — \u4ec5\u8fd4\u56de\u524d 3 \u6761<\/span>
        \nSELECT<\/span> *<\/span> FROM<\/span> students LIMIT<\/span> 0<\/span>,<\/span> 3<\/span>;<\/span><\/p>\n

        — \u4ece\u7b2c 2 \u6761\u5f00\u59cb\u8fd4\u56de 5 \u6761（\u5206\u9875\u573a\u666f：offset, size）<\/span>
        \nSELECT<\/span> *<\/span> FROM<\/span> students LIMIT<\/span> 1<\/span>,<\/span> 5<\/span>;<\/span><\/p>\n

        \n

        \u516b\u3001UNION \u8054\u5408\u67e5\u8be2<\/h3>\n

        UNION \u7528\u4e8e\u628a\u4e24\u4e2a\u6216\u591a\u4e2a SELECT \u67e5\u8be2\u7ed3\u679c\u5408\u5e76\u5230\u4e00\u8d77\u3002<\/p>\n

        — \u57fa\u672c\u8bed\u6cd5<\/span>
        \nSELECT<\/span> \u5b57\u6bb5\u5217\u8868 FROM<\/span> \u88681<\/span>
        \nUNION<\/span>
        \nSELECT<\/span> \u5b57\u6bb5\u5217\u8868 FROM<\/span> \u88682<\/span>;<\/span><\/p>\n

        \u793a\u4f8b：\u5408\u5e76\u4e24\u4e2a\u73ed\u7ea7\u7684\u67e5\u8be2\u7ed3\u679c<\/p>\n

        SELECT<\/span> real_name FROM<\/span> students WHERE<\/span> class_id =<\/span> 1<\/span>
        \nUNION<\/span>
        \nSELECT<\/span> real_name FROM<\/span> students WHERE<\/span> class_id =<\/span> 2<\/span>;<\/span><\/p>\n

        UNION \u4e0e UNION ALL \u7684\u533a\u522b：<\/p>\n\n\u5173\u952e\u5b57\u884c\u4e3a\u7279\u70b9<\/tr>\n\n\n\n
        UNION<\/td>\n\u5408\u5e76\u7ed3\u679c\u5e76\u81ea\u52a8\u53bb\u91cd<\/td>\n\u7ed3\u679c\u552f\u4e00，\u4f46\u591a\u4e00\u6b21\u53bb\u91cd\u5f00\u9500<\/td>\n<\/tr>\n
        UNION ALL<\/td>\n\u5408\u5e76\u7ed3\u679c\u4e0d\u53bb\u91cd<\/td>\n\u4fdd\u7559\u5168\u90e8\u884c，\u6267\u884c\u6548\u7387\u66f4\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \u5173\u952e\u4f7f\u7528\u8981\u6c42：<\/p>\n

      • \u53c2\u4e0e\u5408\u5e76\u7684\u591a\u6761 SELECT \u8bed\u53e5\u8fd4\u56de\u7684\u5217\u6570\u5fc5\u987b\u5b8c\u5168\u4e00\u81f4<\/li>\n
      • \u5bf9\u5e94\u4f4d\u7f6e\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u5e94\u5c3d\u91cf\u517c\u5bb9<\/li>\n
        \n

        \u4e5d\u3001\u6613\u9519\u70b9\u603b\u7ed3<\/h3>\n\n\u6613\u9519\u70b9\u6b63\u786e\u505a\u6cd5<\/tr>\n\n\n\n\n\n\n
        \u8bed\u53e5\u7ed3\u5c3e\u6f0f\u5206\u53f7<\/td>\n\u591a\u6570 SQL \u8bed\u53e5\u7ed3\u5c3e\u9700\u8981\u52a0\u82f1\u6587 ;，\u4e0d\u52a0\u4f1a\u8fdb\u5165\u591a\u884c\u7b49\u5f85\u6a21\u5f0f<\/td>\n<\/tr>\n
        \u547d\u4ee4\u884c\u5bc6\u7801\u5e26\u7a7a\u683c<\/td>\nmysql -p \u540e\u7981\u6b62\u52a0\u7a7a\u683c\u548c\u660e\u6587\u5bc6\u7801，\u56de\u8f66\u540e\u8f93\u5165\u65e0\u56de\u663e<\/td>\n<\/tr>\n
        \u6ce8\u91ca\u7b26\u4f7f\u7528\u9519\u8bef<\/td>\n\u5355\u884c\u6ce8\u91ca — \u540e\u5fc5\u987b\u52a0\u7a7a\u683c；# \u4e5f\u53ef\u4f5c\u884c\u6ce8\u91ca；\/* *\/ \u591a\u884c\u6ce8\u91ca<\/td>\n<\/tr>\n
        \u5b57\u7b26\u4e32\u9057\u6f0f\u5f15\u53f7<\/td>\n\u5b57\u7b26\u4e32\u503c\u5fc5\u987b\u7528\u82f1\u6587\u5355\u5f15\u53f7 ' \u5305\u88f9，\u5fd8\u8bb0\u95ed\u5408\u4f1a\u8bed\u6cd5\u9519\u8bef<\/td>\n<\/tr>\n
        UPDATE\/DELETE \u5fd8\u5199 WHERE<\/td>\n\u5fd8\u5199 WHERE \u4f1a\u4fee\u6539\u6216\u5220\u9664\u6574\u5f20\u8868，\u662f\u5178\u578b\u4e8b\u6545\u70b9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
        \n

        \u5341\u3001\u77e5\u8bc6\u5c0f\u7ed3<\/h3>\n\n\u77e5\u8bc6\u6a21\u5757\u6838\u5fc3\u5185\u5bb9\u4e00\u53e5\u8bdd\u901f\u8bb0<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n
        \u6570\u636e\u5e93<\/td>\n\u6309\u7ed3\u6784\u7ec4\u7ec7\u3001\u5b58\u50a8\u3001\u7ba1\u7406\u6570\u636e\u7684\u96c6\u5408<\/td>\n\u5927\u578b\u56fe\u4e66\u9986<\/td>\n<\/tr>\n
        DBMS<\/td>\n\u521b\u5efa\u5e93\u8868\u3001\u6267\u884c SQL\u3001\u63a7\u5236\u6743\u9650\u7684\u8f6f\u4ef6<\/td>\n\u56fe\u4e66\u7ba1\u7406\u5458<\/td>\n<\/tr>\n
        \u57fa\u7840\u5bf9\u8c61<\/td>\n\u8868\/\u8bb0\u5f55\/\u5b57\u6bb5\/\u4e3b\u952e\/\u5916\u952e\/\u7d22\u5f15<\/td>\n\u4e3b\u952e\u5b9a\u4f4d\u3001\u5916\u952e\u5173\u8054\u3001\u7d22\u5f15\u63d0\u901f<\/td>\n<\/tr>\n
        \u8fde\u63a5\u65b9\u5f0f<\/td>\nNavicat \u56fe\u5f62\u5316 + mysql \u547d\u4ee4\u884c<\/td>\n\u56fe\u5f62\u5316\u5e95\u5c42\u4e5f\u662f SQL<\/td>\n<\/tr>\n
        SQL \u5206\u7c7b<\/td>\nDDL\/DML\/DQL\/DCL<\/td>\n\u6539\u7ed3\u6784\/\u6539\u6570\u636e\/\u67e5\u6570\u636e\/\u63a7\u6743\u9650<\/td>\n<\/tr>\n
        INSERT<\/td>\n\u5355\u6761\/\u6279\u91cf\u63d2\u5165，\u503c\u7528\u5355\u5f15\u53f7<\/td>\n\u5b57\u6bb5\u503c\u4e00\u4e00\u5bf9\u5e94<\/td>\n<\/tr>\n
        UPDATE<\/td>\nSET + WHERE<\/td>\n\u5fd8\u5199 WHERE \u5168\u8868\u88ab\u6539<\/td>\n<\/tr>\n
        DELETE<\/td>\nDELETE FROM + WHERE<\/td>\n\u5fd8\u5199 WHERE \u5168\u8868\u88ab\u5220<\/td>\n<\/tr>\n
        SELECT<\/td>\n* \/ \u6307\u5b9a\u5b57\u6bb5 \/ DISTINCT \/ ORDER BY \/ LIMIT<\/td>\n\u67e5\u8be2\u80fd\u529b\u662f\u540e\u7eed\u57fa\u7840<\/td>\n<\/tr>\n
        UNION<\/td>\n\u5408\u5e76\u7ed3\u679c\u96c6，UNION \u53bb\u91cd\u3001UNION ALL \u4e0d\u53bb\u91cd<\/td>\n\u5217\u6570\u5fc5\u987b\u4e00\u81f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \u5408\u89c4\u58f0\u660e：\u672c\u8bfe\u6240\u6709 SQL \u64cd\u4f5c\u5747\u5728\u672c\u5730 phpStudy \u7684 MySQL \u73af\u5883\u4e2d\u6267\u884c，\u4ec5\u7528\u4e8e\u5b66\u4e60\u76ee\u7684\u3002\u4e25\u7981\u5728\u672a\u6388\u6743\u7684\u6570\u636e\u5e93\u4e0a\u6267\u884c\u4efb\u4f55 SQL \u64cd\u4f5c\u3002<\/p>\n

        \n

        \u4ece\u6570\u636e\u5e93\u6982\u5ff5\u5230 CRUD \u64cd\u4f5c，\u4ece SELECT \u67e5\u8be2\u5230 UNION \u8054\u5408\u67e5\u8be2，MySQL \u57fa\u7840\u662f\u6570\u636e\u5e93\u5b89\u5168\u7684\u8d77\u70b9\u3002\u8bb0\u4f4f：\u67e5\u8be2（DQL）\u80fd\u529b\u51b3\u5b9a\u4e86\u540e\u7eed\u4fe1\u606f\u83b7\u53d6\u7684\u80fd\u529b，\u6743\u9650\u63a7\u5236（DCL）\u51b3\u5b9a\u4e86\u8d26\u53f7\u80fd\u505a\u4ec0\u4e48，information_schema \u662f\u6570\u636e\u5e93\u7ed3\u6784\u679a\u4e3e\u7684\u5173\u952e\u5165\u53e3\u3002\u4e0b\u4e00\u7bc7\u5c06\u8fdb\u5165\u6761\u4ef6 SQL \u4e0e SQL \u6ce8\u5165\u539f\u7406\u2014\u2014\u7528\u6237\u7684\u8f93\u5165\u4e3a\u4ec0\u4e48\u4f1a\u6539\u53d8 SQL \u8bed\u53e5\u7684\u539f\u610f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        \u5b66\u5b8c Python \u81ea\u52a8\u5316，\u6211\u4eec\u8fdb\u5165\u6570\u636e\u5e93\u5b89\u5168\u65b9\u5411\u3002SQL \u6ce8\u5165\u662f Web \u5b89\u5168\u4e2d\u6700\u7ecf\u5178\u7684\u6f0f\u6d1e，\u800c\u7406\u89e3 SQL \u6ce8\u5165\u7684\u524d\u63d0，\u662f\u5148\u638c\u63e1\u6570\u636e\u5e93\u672c\u8eab\u3002\u8fd9\u4e00\u7bc7\u4ece MySQL \u57fa\u7840\u5f00\u59cb：\u6570\u636e\u5e93\u4e0e DBMS \u7684\u6982\u5ff5\u3001\u8868\/\u8bb0\u5f55\/\u5b57\u6bb5\u7b49\u57fa\u7840\u5bf9\u8c61\u3001\u547d\u4ee4\u884c\u8fde\u63a5\u3001SQL \u56db\u5927\u5206\u7c7b\u3001CRUD \u589e\u5220\u6539\u67e5\u548c UNION \u8054\u5408\u67e5\u8be2\u3002\u638c\u63e1\u8fd9\u4e9b\u67e5\u8be2\u80fd\u529b，\u540e\u7eed\u7406\u89e3\u6ce8\u5165\u539f\u7406\u548c\u6570\u636e\u679a\u4e3e\u5c31\u662f\u6c34\u5230\u6e20\u6210\u7684\u4e8b\u3002\u4e00\u3001\u6570\u636e\u5e93\u57fa\u672c\u6982\u5ff5
        \n1.1 \u4ec0\u4e48\u662f\u6570\u636e\u5e93
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