{"id":1512,"date":"2025-02-10T23:35:08","date_gmt":"2025-02-10T15:35:08","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1512"},"modified":"2025-02-10T23:35:10","modified_gmt":"2025-02-10T15:35:10","slug":"sql%e6%95%b0%e6%8d%ae%e5%ba%93%e8%ae%be%e8%ae%a1%e4%b8%8e%e5%bb%ba%e6%a8%a1%ef%bc%9a%e4%bb%8e%e8%a1%a8%e8%ae%be%e8%ae%a1%e5%88%b0%e7%b4%a2%e5%bc%95%e4%bc%98%e5%8c%96%e7%9a%84%e5%85%a8%e9%9d%a2","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/10\/sql%e6%95%b0%e6%8d%ae%e5%ba%93%e8%ae%be%e8%ae%a1%e4%b8%8e%e5%bb%ba%e6%a8%a1%ef%bc%9a%e4%bb%8e%e8%a1%a8%e8%ae%be%e8%ae%a1%e5%88%b0%e7%b4%a2%e5%bc%95%e4%bc%98%e5%8c%96%e7%9a%84%e5%85%a8%e9%9d%a2\/","title":{"rendered":"SQL\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u5efa\u6a21\uff1a\u4ece\u8868\u8bbe\u8ba1\u5230\u7d22\u5f15\u4f18\u5316\u7684\u5168\u9762\u6307\u5357"},"content":{"rendered":"\n

\u4ee5\u4e0b\u662fSQL\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u5efa\u6a21\uff1a\u4ece\u8868\u8bbe\u8ba1\u5230\u7d22\u5f15\u4f18\u5316\u7684\u5168\u9762\u6307\u5357<\/strong>\u90e8\u5206\u7684\u8be6\u7ec6\u6559\u7a0b\u3002\u6211\u4eec\u5c06\u91cd\u70b9\u8bb2\u89e3\u8868\u4e0e\u6570\u636e\u7c7b\u578b\u8bbe\u8ba1\u3001\u6570\u636e\u5e93\u8303\u5f0f\u3001\u4e3b\u952e\u4e0e\u5916\u952e\u7684\u4f7f\u7528\u3001\u7d22\u5f15\u7684\u521b\u5efa\u4e0e\u4f18\u5316\uff0c\u4ee5\u53ca\u5173\u7cfb\u6a21\u578b\u7684\u5e94\u7528\u3002<\/p>\n\n\n\n

\n\n\n\n

1. \u8868\u4e0e\u6570\u636e\u7c7b\u578b\u8bbe\u8ba1<\/strong><\/h3>\n\n\n\n

\u8868\u8bbe\u8ba1\u662f\u6570\u636e\u5e93\u8bbe\u8ba1\u4e2d\u6700\u57fa\u7840\u4e5f\u662f\u6700\u5173\u952e\u7684\u4e00\u90e8\u5206\u3002\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4ec5\u80fd\u591f\u6709\u6548\u5b58\u50a8\u6570\u636e\uff0c\u8fd8\u80fd\u786e\u4fdd\u67e5\u8be2\u6027\u80fd\u548c\u6570\u636e\u5b8c\u6574\u6027\u3002<\/p>\n\n\n\n

1.1 \u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b<\/h4>\n\n\n\n

\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u5bf9\u4e8e\u6570\u636e\u5e93\u7684\u6027\u80fd\u548c\u6570\u636e\u5b8c\u6574\u6027\u81f3\u5173\u91cd\u8981\u3002\u6bcf\u79cd\u6570\u636e\u7c7b\u578b\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\uff0c\u6b63\u786e\u9009\u62e9\u53ef\u4ee5\u6700\u5927\u5316\u67e5\u8be2\u6027\u80fd\u548c\u5b58\u50a8\u6548\u7387\u3002<\/p>\n\n\n\n

    \n
  • \u6574\u6570\u7c7b\u578b<\/strong>\uff1aINT<\/code>, BIGINT<\/code>, SMALLINT<\/code><\/li>\n\n\n\n
  • \u9002\u7528\u4e8e\u5b58\u50a8\u6574\u6570\u503c\u3002<\/li>\n\n\n\n
  • \u4f8b\u5982\uff0c\u7528\u6237\u7684 ID<\/code> \u5b57\u6bb5\u901a\u5e38\u4f7f\u7528 INT<\/code> \u7c7b\u578b\u3002<\/li>\n\n\n\n
  • \u6d6e\u52a8\u70b9\u6570\u7c7b\u578b<\/strong>\uff1aFLOAT<\/code>, DOUBLE<\/code>, DECIMAL<\/code><\/li>\n\n\n\n
  • \u9002\u7528\u4e8e\u5b58\u50a8\u6570\u503c\uff0c\u5305\u62ec\u5c0f\u6570\u70b9\u540e\u7684\u6570\u636e\u3002<\/li>\n\n\n\n
  • \u4f8b\u5982\uff0c\u4ef7\u683c\u5b57\u6bb5\u901a\u5e38\u4f7f\u7528 DECIMAL<\/code> \u7c7b\u578b\u3002<\/li>\n\n\n\n
  • \u5b57\u7b26\u7c7b\u578b<\/strong>\uff1aVARCHAR<\/code>, CHAR<\/code>, TEXT<\/code><\/li>\n\n\n\n
  • \u9002\u7528\u4e8e\u5b58\u50a8\u5b57\u7b26\u4e32\u6570\u636e\u3002<\/li>\n\n\n\n
  • VARCHAR<\/code> \u662f\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32\uff0c\u9002\u7528\u4e8e\u957f\u5ea6\u4e0d\u56fa\u5b9a\u7684\u6570\u636e\u3002<\/li>\n\n\n\n
  • CHAR<\/code> \u662f\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32\uff0c\u9002\u7528\u4e8e\u957f\u5ea6\u56fa\u5b9a\u7684\u6570\u636e\uff0c\u5982\u56fd\u5bb6\u4ee3\u7801\u3002<\/li>\n\n\n\n
  • \u65e5\u671f\u4e0e\u65f6\u95f4\u7c7b\u578b<\/strong>\uff1aDATE<\/code>, TIME<\/code>, DATETIME<\/code>, TIMESTAMP<\/code><\/li>\n\n\n\n
  • \u7528\u4e8e\u5b58\u50a8\u65e5\u671f\u3001\u65f6\u95f4\u548c\u65f6\u95f4\u6233\u3002<\/li>\n\n\n\n
  • \u4f8b\u5982\uff0c\u7528\u6237\u7684 birth_date<\/code> \u901a\u5e38\u4f7f\u7528 DATE<\/code> \u7c7b\u578b\uff0c\u8ba2\u5355\u7684\u65f6\u95f4\u6233\u4f7f\u7528 TIMESTAMP<\/code> \u7c7b\u578b\u3002<\/li>\n<\/ul>\n\n\n\n

    1.2 \u89c4\u8303\u5316\u6570\u636e\u5e93\u8bbe\u8ba1<\/h4>\n\n\n\n

    \u6570\u636e\u5e93\u89c4\u8303\u5316\u662f\u6d88\u9664\u5197\u4f59\u6570\u636e\u3001\u63d0\u9ad8\u6570\u636e\u4e00\u81f4\u6027\u548c\u51cf\u5c11\u5f02\u5e38\u7684\u4e00\u79cd\u8bbe\u8ba1\u6280\u672f\u3002<\/p>\n\n\n\n

      \n
    • \u7b2c\u4e00\u8303\u5f0f (1NF)<\/strong>\uff1a\u786e\u4fdd\u6bcf\u4e2a\u5217\u4e2d\u7684\u6570\u636e\u662f\u539f\u5b50\u7684\uff0c\u4e0d\u80fd\u6709\u91cd\u590d\u7684\u7ec4\u6216\u6570\u7ec4\u3002<\/li>\n\n\n\n
    • \u793a\u4f8b\uff1a\u4e0d\u5e94\u8be5\u5728\u5355\u4e2a\u5217\u4e2d\u5b58\u50a8\u591a\u4e2a\u7535\u8bdd\u53f7\u7801\u3002<\/li>\n\n\n\n
    • \u7b2c\u4e8c\u8303\u5f0f (2NF)<\/strong>\uff1a\u786e\u4fdd\u6ee1\u8db31NF\uff0c\u5e76\u4e14\u6bcf\u4e2a\u975e\u4e3b\u952e\u5217\u5b8c\u5168\u4f9d\u8d56\u4e8e\u4e3b\u952e\u3002<\/li>\n\n\n\n
    • \u793a\u4f8b\uff1a\u5982\u679c\u4e00\u4e2a\u8868\u6709\u590d\u5408\u4e3b\u952e\uff0c\u90a3\u4e48\u6240\u6709\u975e\u4e3b\u952e\u5217\u5fc5\u987b\u4f9d\u8d56\u4e8e\u590d\u5408\u4e3b\u952e\u7684\u6574\u4e2a\u7ec4\u5408\uff0c\u800c\u4e0d\u662f\u5176\u4e2d\u7684\u4e00\u90e8\u5206\u3002<\/li>\n\n\n\n
    • \u7b2c\u4e09\u8303\u5f0f (3NF)<\/strong>\uff1a\u786e\u4fdd\u6ee1\u8db32NF\uff0c\u5e76\u4e14\u6240\u6709\u975e\u4e3b\u952e\u5217\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u975e\u4e3b\u952e\u5217\u3002<\/li>\n\n\n\n
    • \u793a\u4f8b\uff1a\u5982\u679c\u4e00\u4e2a\u8868\u6709 city<\/code> \u548c state<\/code> \u5217\uff0c\u800c state<\/code> \u5b8c\u5168\u7531 city<\/code> \u786e\u5b9a\uff0c\u90a3\u4e48\u5e94\u8be5\u5c06 state<\/code> \u79fb\u5230\u4e00\u4e2a\u72ec\u7acb\u7684\u8868\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n

      1.3 \u4e3b\u952e\u4e0e\u5916\u952e\u7684\u4f7f\u7528<\/h4>\n\n\n\n
        \n
      • \u4e3b\u952e<\/strong>\uff1a\u4e3b\u952e\u662f\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u6bcf\u6761\u8bb0\u5f55\u7684\u5b57\u6bb5\u6216\u5b57\u6bb5\u7ec4\u5408\u3002\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u4e14\u4e3b\u952e\u7684\u5b57\u6bb5\u503c\u4e0d\u80fd\u4e3a\u7a7a\u3002<\/li>\n\n\n\n
      • \u793a\u4f8b\uff1a CREATE TABLE users ( id INT PRIMARY KEY, name VARCHAR(100), age INT );<\/code><\/li>\n\n\n\n
      • \u5916\u952e<\/strong>\uff1a\u5916\u952e\u662f\u8868\u4e0e\u8868\u4e4b\u95f4\u5efa\u7acb\u5173\u7cfb\u7684\u5b57\u6bb5\uff0c\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002\u5916\u952e\u5b57\u6bb5\u7684\u503c\u5fc5\u987b\u5b58\u5728\u4e8e\u53e6\u4e00\u8868\u7684\u4e3b\u952e\u4e2d\uff0c\u6216\u4e3a\u7a7a\u3002<\/li>\n\n\n\n
      • \u793a\u4f8b\uff1a
        sql CREATE TABLE orders ( order_id INT PRIMARY KEY, user_id INT, order_date DATE, FOREIGN KEY (user_id) REFERENCES users(id) );<\/code><\/li>\n<\/ul>\n\n\n\n

        2. \u7d22\u5f15\u4e0e\u6027\u80fd\u4f18\u5316<\/strong><\/h3>\n\n\n\n

        \u7d22\u5f15\u662f\u6570\u636e\u5e93\u4e2d\u7528\u6765\u52a0\u901f\u6570\u636e\u67e5\u8be2\u7684\u7ed3\u6784\u3002\u5408\u7406\u7684\u7d22\u5f15\u8bbe\u8ba1\u80fd\u591f\u5927\u5e45\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u4e5f\u4f1a\u589e\u52a0\u63d2\u5165\u3001\u5220\u9664\u3001\u66f4\u65b0\u7684\u6210\u672c\uff0c\u56e0\u6b64\u9700\u8981\u6839\u636e\u5b9e\u9645\u4f7f\u7528\u573a\u666f\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n\n\n\n

        2.1 \u521b\u5efa\u7d22\u5f15\uff1aCREATE INDEX<\/code><\/h4>\n\n\n\n

        \u7d22\u5f15\u662f\u901a\u8fc7 CREATE INDEX<\/code> \u8bed\u53e5\u6765\u521b\u5efa\u7684\uff0c\u5b83\u53ef\u4ee5\u52a0\u901f\u67e5\u8be2\uff0c\u4f46\u4f1a\u5360\u7528\u989d\u5916\u7684\u78c1\u76d8\u7a7a\u95f4\u548c\u589e\u52a0\u6570\u636e\u5e93\u7ef4\u62a4\u7684\u6210\u672c\u3002<\/p>\n\n\n\n

          \n
        • \u793a\u4f8b\uff1a\u4e3a users<\/code> \u8868\u7684 name<\/code> \u5217\u521b\u5efa\u7d22\u5f15\uff1a<\/li>\n<\/ul>\n\n\n\n
            CREATE INDEX idx_users_name ON users(name);<\/code><\/pre>\n\n\n\n
          2.2 \u7d22\u5f15\u7c7b\u578b<\/h4>\n\n\n\n
          \u4e0d\u540c\u7c7b\u578b\u7684\u7d22\u5f15\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u67e5\u8be2\u573a\u666f\u3002\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n\n\n\n
            \n
          • \u5355\u5217\u7d22\u5f15<\/strong>\uff1a\u9488\u5bf9\u5355\u4e00\u5217\u521b\u5efa\u7d22\u5f15\u3002<\/li>\n\n\n\n
          • \u793a\u4f8b\uff1a\u4e3a name<\/code> \u5217\u521b\u5efa\u5355\u5217\u7d22\u5f15\uff1a CREATE INDEX idx_name ON users(name);<\/code><\/li>\n\n\n\n
          • \u590d\u5408\u7d22\u5f15<\/strong>\uff1a\u5f53\u67e5\u8be2\u6d89\u53ca\u591a\u4e2a\u5217\u65f6\uff0c\u521b\u5efa\u590d\u5408\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n\n\n\n
          • \u793a\u4f8b\uff1a\u4e3a name<\/code> \u548c age<\/code> \u5217\u521b\u5efa\u590d\u5408\u7d22\u5f15\uff1a CREATE INDEX idx_name_age ON users(name, age);<\/code><\/li>\n\n\n\n
          • \u552f\u4e00\u7d22\u5f15<\/strong>\uff1a\u552f\u4e00\u7d22\u5f15\u786e\u4fdd\u7d22\u5f15\u5217\u7684\u6bcf\u4e2a\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u5e38\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u7684\u552f\u4e00\u6027\u3002<\/li>\n\n\n\n
          • \u793a\u4f8b\uff1a\u4e3a email<\/code> \u5217\u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff1a
            sql CREATE UNIQUE INDEX idx_email ON users(email);<\/code><\/li>\n<\/ul>\n\n\n\n
            2.3 \u7d22\u5f15\u4f18\u5316\u7b56\u7565<\/h4>\n\n\n\n
              \n
            • \u9009\u62e9\u5408\u9002\u7684\u5217\u521b\u5efa\u7d22\u5f15<\/strong>\uff1a\u5e94\u5bf9\u67e5\u8be2\u6761\u4ef6\u4e2d\u7ecf\u5e38\u51fa\u73b0\u7684\u5217\uff08\u5982 WHERE<\/code> \u5b50\u53e5\u4e2d\u7684\u5217\uff09\u521b\u5efa\u7d22\u5f15\u3002<\/li>\n\n\n\n
            • \u907f\u514d\u5728\u9891\u7e41\u66f4\u65b0\u7684\u5217\u4e0a\u521b\u5efa\u7d22\u5f15<\/strong>\uff1a\u7d22\u5f15\u9700\u8981\u7ef4\u62a4\uff0c\u5982\u679c\u67d0\u4e2a\u5217\u9891\u7e41\u66f4\u65b0\u3001\u5220\u9664\uff0c\u521b\u5efa\u7d22\u5f15\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n\n\n\n
            • \u4f7f\u7528\u8986\u76d6\u7d22\u5f15<\/strong>\uff1a\u8986\u76d6\u7d22\u5f15\u80fd\u591f\u8ba9\u6570\u636e\u5e93\u76f4\u63a5\u4ece\u7d22\u5f15\u4e2d\u83b7\u53d6\u6240\u6709\u6570\u636e\uff0c\u800c\u65e0\u9700\u8bbf\u95ee\u8868\u6570\u636e\uff0c\u6781\u5927\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n
              3. \u5173\u7cfb\u6a21\u578b<\/strong><\/h3>\n\n\n\n
              \u5173\u7cfb\u6a21\u578b\u662f\u4e00\u79cd\u5c06\u6570\u636e\u7ec4\u7ec7\u4e3a\u8868\u683c\u7684\u6a21\u578b\uff0c\u6bcf\u4e2a\u8868\u683c\u4ee3\u8868\u4e00\u4e2a\u5b9e\u4f53\u6216\u5173\u7cfb\u3002\u8868\u4e0e\u8868\u4e4b\u95f4\u901a\u8fc7\u5916\u952e\u5efa\u7acb\u8054\u7cfb\u3002<\/p>\n\n\n\n
              3.1 \u8868\u7684\u5173\u7cfb<\/h4>\n\n\n\n
              \u8868\u4e0e\u8868\u4e4b\u95f4\u901a\u5e38\u6709\u4ee5\u4e0b\u51e0\u79cd\u5173\u7cfb\uff1a<\/p>\n\n\n\n
                \n
              • \u4e00\u5bf9\u4e00\uff081:1\uff09\u5173\u7cfb<\/strong>\uff1a\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55\u3002\u901a\u5e38\u901a\u8fc7\u4e3b\u952e-\u5916\u952e\u7ea6\u675f\u5efa\u7acb\u3002<\/li>\n\n\n\n
              • \u793a\u4f8b\uff1a\u4e00\u4e2a\u7528\u6237\u4e0e\u4e00\u4e2a\u7528\u6237\u7684\u914d\u5076\u4fe1\u606f\uff1a CREATE TABLE users ( id INT PRIMARY KEY, name VARCHAR(100) ); CREATE TABLE spouses ( id INT PRIMARY KEY, user_id INT, spouse_name VARCHAR(100), FOREIGN KEY (user_id) REFERENCES users(id) );<\/code><\/li>\n\n\n\n
              • \u4e00\u5bf9\u591a\uff081:N\uff09\u5173\u7cfb<\/strong>\uff1a\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55\u53ef\u4ee5\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\uff0c\u901a\u5e38\u901a\u8fc7\u5916\u952e\u5b9e\u73b0\u3002<\/li>\n\n\n\n
              • \u793a\u4f8b\uff1a\u4e00\u4e2a\u7528\u6237\u6709\u591a\u6761\u8ba2\u5355\u8bb0\u5f55\uff1a CREATE TABLE users ( id INT PRIMARY KEY, name VARCHAR(100) ); CREATE TABLE orders ( order_id INT PRIMARY KEY, user_id INT, order_date DATE, FOREIGN KEY (user_id) REFERENCES users(id) );<\/code><\/li>\n\n\n\n
              • \u591a\u5bf9\u591a\uff08N:M\uff09\u5173\u7cfb<\/strong>\uff1a\u591a\u4e2a\u8bb0\u5f55\u53ef\u4ee5\u4e0e\u591a\u4e2a\u8bb0\u5f55\u76f8\u5173\u8054\uff0c\u901a\u5e38\u901a\u8fc7\u4e2d\u95f4\u8868\u6765\u5b9e\u73b0\u3002<\/li>\n\n\n\n
              • \u793a\u4f8b\uff1a\u4e00\u4e2a\u5b66\u751f\u53ef\u4ee5\u9009\u4fee\u591a\u95e8\u8bfe\u7a0b\uff0c\u4e00\u95e8\u8bfe\u7a0b\u4e5f\u53ef\u4ee5\u6709\u591a\u4e2a\u5b66\u751f\uff1a CREATE TABLE students ( student_id INT PRIMARY KEY, name VARCHAR(100) ); CREATE TABLE courses ( course_id INT PRIMARY KEY, course_name VARCHAR(100) ); CREATE TABLE student_courses ( student_id INT, course_id INT, FOREIGN KEY (student_id) REFERENCES students(student_id), FOREIGN KEY (course_id) REFERENCES courses(course_id), PRIMARY KEY (student_id, course_id) );<\/code><\/li>\n<\/ul>\n\n\n\n
                3.2 \u4f7f\u7528\u5916\u952e\u7ea6\u675f\u4fdd\u6301\u6570\u636e\u4e00\u81f4\u6027<\/h4>\n\n\n\n
                \u5916\u952e\u7ea6\u675f\u786e\u4fdd\u5f53\u4f60\u5728\u4e3b\u8868\u4e2d\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u8bb0\u5f55\u65f6\uff0c\u76f8\u5173\u7684\u8bb0\u5f55\u5728\u5176\u4ed6\u8868\u4e2d\u4e5f\u4f1a\u53d7\u5230\u76f8\u5e94\u5f71\u54cd\uff0c\u4ece\u800c\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n
                  \n
                • \u793a\u4f8b\uff1a\u5982\u679c\u5220\u9664 users<\/code> \u8868\u4e2d\u7684\u8bb0\u5f55\u65f6\uff0c\u8981\u786e\u4fdd\u4e0e\u4e4b\u5173\u8054\u7684 orders<\/code> \u8bb0\u5f55\u4e0d\u4f1a\u5b64\u7acb\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528\u5916\u952e\u7ea6\u675f\uff1a<\/li>\n<\/ul>\n\n\n\n
                    CREATE TABLE orders (\n    order_id INT PRIMARY KEY,\n    user_id INT,\n    order_date DATE,\n    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE\n  );<\/code><\/pre>\n\n\n\n
                  ON DELETE CASCADE<\/code> \u9009\u9879\u8868\u793a\u5f53\u7528\u6237\u88ab\u5220\u9664\u65f6\uff0c\u6240\u6709\u4e0e\u8be5\u7528\u6237\u5173\u8054\u7684\u8ba2\u5355\u4e5f\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\u3002<\/p>\n\n\n\n
                  \n\n\n\n
                  \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
                  \u672c\u6559\u7a0b\u8be6\u7ec6\u4ecb\u7ecd\u4e86SQL\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u5efa\u6a21\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u5305\u62ec\u8868\u4e0e\u6570\u636e\u7c7b\u578b\u7684\u8bbe\u8ba1\u539f\u5219\u3001\u6570\u636e\u5e93\u8303\u5f0f\u7684\u5e94\u7528\u3001\u4e3b\u952e\u548c\u5916\u952e\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5982\u4f55\u521b\u5efa\u548c\u4f18\u5316\u7d22\u5f15\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u8ba1\u8868\u7ed3\u6784\u548c\u9009\u62e9\u5408\u9002\u7684\u7d22\u5f15\uff0c\u4f60\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6570\u636e\u5e93\u6027\u80fd\u548c\u6570\u636e\u4e00\u81f4\u6027\u3002\u800c\u7406\u89e3\u548c\u5e94\u7528\u5173\u7cfb\u6a21\u578b\uff0c\u5c06\u5e2e\u52a9\u4f60\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u6b63\u786e\u8bbe\u8ba1\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u638c\u63e1\u8fd9\u4e9b\u8bbe\u8ba1\u6280\u5de7\uff0c\u5bf9\u4e8e\u6784\u5efa\u9ad8\u6548\u4e14\u53ef\u7ef4\u62a4\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u81f3\u5173\u91cd\u8981\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                  \u4ee5\u4e0b\u662fSQL\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u5efa\u6a21\uff1a\u4ece\u8868\u8bbe\u8ba1\u5230\u7d22\u5f15\u4f18\u5316\u7684\u5168\u9762\u6307\u5357\u90e8\u5206\u7684\u8be6\u7ec6\u6559\u7a0b\u3002\u6211\u4eec\u5c06\u91cd\u70b9\u8bb2\u89e3\u8868\u4e0e\u6570\u636e\u7c7b\u578b\u8bbe\u8ba1\u3001\u6570\u636e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-1512","post","type-post","status-publish","format-standard","hentry","category-sql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=1512"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1512\/revisions"}],"predecessor-version":[{"id":1513,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1512\/revisions\/1513"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}