{"id":1635,"date":"2025-02-14T23:12:34","date_gmt":"2025-02-14T15:12:34","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1635"},"modified":"2025-02-14T23:28:07","modified_gmt":"2025-02-14T15:28:07","slug":"mysql-%e8%bf%9b%e9%98%b6-sql-%e6%95%99%e7%a8%8b%ef%bc%9a%e5%a4%8d%e6%9d%82%e6%9f%a5%e8%af%a2%e3%80%81%e4%ba%8b%e5%8a%a1%e4%b8%8e%e9%94%81%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/14\/mysql-%e8%bf%9b%e9%98%b6-sql-%e6%95%99%e7%a8%8b%ef%bc%9a%e5%a4%8d%e6%9d%82%e6%9f%a5%e8%af%a2%e3%80%81%e4%ba%8b%e5%8a%a1%e4%b8%8e%e9%94%81%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3\/","title":{"rendered":"MySQL \u8fdb\u9636 SQL \u6559\u7a0b\uff1a\u590d\u6742\u67e5\u8be2\u3001\u4e8b\u52a1\u4e0e\u9501\u673a\u5236\u8be6\u89e3"},"content":{"rendered":"\r\n

\u7ee7\u7eed\u6df1\u5165\u5b66\u4e60\u7b2c\u4e8c\u90e8\u5206\uff0c\u8fdb\u9636 SQL \u4f7f\u7528<\/strong>\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u66f4\u9ad8\u7ea7\u7684 SQL \u6280\u5de7\uff0c\u5305\u62ec\u590d\u6742\u67e5\u8be2\u3001\u4e8b\u52a1\u7ba1\u7406\u3001\u9501\u673a\u5236\u4ee5\u53ca\u5982\u4f55\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u7b49\u3002\u6bcf\u4e2a\u90e8\u5206\u90fd\u4f1a\u63d0\u4f9b\u66f4\u8be6\u7ec6\u7684\u5185\u5bb9\u548c\u793a\u4f8b\uff0c\u5e2e\u52a9\u4f60\u66f4\u5168\u9762\u5730\u638c\u63e1 MySQL \u7684\u9ad8\u7ea7\u4f7f\u7528\u3002<\/p>\r\n\r\n\r\n\r\n

1. \u9ad8\u7ea7 SQL \u67e5\u8be2<\/strong><\/h3>\r\n\r\n\r\n\r\n

1.1. \u805a\u5408\u51fd\u6570<\/strong><\/h4>\r\n\r\n\r\n\r\n

\u805a\u5408\u51fd\u6570\u7528\u4e8e\u5bf9\u4e00\u7ec4\u6570\u636e\u6267\u884c\u67d0\u4e9b\u8ba1\u7b97\uff0c\u901a\u5e38\u4e0e GROUP BY<\/code> \u914d\u5408\u4f7f\u7528\u3002<\/p>\r\n\r\n\r\n\r\n

    \r\n
  • COUNT()<\/strong>\uff1a\u8ba1\u7b97\u67d0\u5217\u7684\u975e\u7a7a\u503c\u6570\u91cf\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
      SELECT COUNT(*) FROM users WHERE age > 30;<\/code><\/pre>\r\n\r\n\r\n\r\n
      \r\n
    • SUM()<\/strong>\uff1a\u8ba1\u7b97\u67d0\u5217\u7684\u603b\u548c\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
        SELECT SUM(salary) FROM employees;<\/code><\/pre>\r\n\r\n\r\n\r\n
        \r\n
      • AVG()<\/strong>\uff1a\u8ba1\u7b97\u67d0\u5217\u7684\u5e73\u5747\u503c\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
          SELECT AVG(age) FROM users;<\/code><\/pre>\r\n\r\n\r\n\r\n
          \r\n
        • MIN() \u548c MAX()<\/strong>\uff1a\u627e\u51fa\u67d0\u5217\u7684\u6700\u5c0f\u503c\u6216\u6700\u5927\u503c\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
            SELECT MIN(age), MAX(age) FROM users;<\/code><\/pre>\r\n\r\n\r\n\r\n
          1.2. \u590d\u6742\u67e5\u8be2<\/strong><\/h4>\r\n\r\n\r\n\r\n
            \r\n
          • \u591a\u8868\u8fde\u63a5\uff08JOIN\uff09<\/strong>
            MySQL \u652f\u6301\u591a\u79cd JOIN \u7c7b\u578b\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u662f INNER JOIN<\/code> \u548c LEFT JOIN<\/code>\u3002\u901a\u8fc7\u8fde\u63a5\u591a\u5f20\u8868\uff0c\u4f60\u53ef\u4ee5\u4ece\u591a\u4e2a\u8868\u4e2d\u83b7\u53d6\u76f8\u5173\u6570\u636e\u3002<\/li>\r\n\r\n\r\n\r\n
          • INNER JOIN<\/strong>\uff1a\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u8bb0\u5f55\u3002 SELECT users.username, orders.amount FROM users INNER JOIN orders ON users.id = orders.user_id;<\/code><\/li>\r\n\r\n\r\n\r\n
          • LEFT JOIN<\/strong>\uff1a\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\uff0c\u4ee5\u53ca\u53f3\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u8bb0\u5f55\u3002\u82e5\u53f3\u8868\u6ca1\u6709\u5339\u914d\u9879\uff0c\u7ed3\u679c\u4e3a NULL<\/code>\u3002 SELECT users.username, orders.amount FROM users LEFT JOIN orders ON users.id = orders.user_id;<\/code><\/li>\r\n\r\n\r\n\r\n
          • SELF JOIN<\/strong>
            SELF JOIN \u662f\u5bf9\u540c\u4e00\u5f20\u8868\u8fdb\u884c\u8fde\u63a5\uff0c\u901a\u5e38\u7528\u4e8e\u67e5\u8be2\u540c\u4e00\u8868\u4e2d\u4e0d\u540c\u8bb0\u5f55\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u4f8b\u5982\uff0c\u67e5\u627e\u5458\u5de5\u4e0e\u5176\u7ecf\u7406\u7684\u5173\u7cfb\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
              SELECT e1.name AS employee, e2.name AS manager\r\n  FROM employees e1\r\n  LEFT JOIN employees e2 ON e1.manager_id = e2.id;<\/code><\/pre>\r\n\r\n\r\n\r\n
              \r\n
            • \u5b50\u67e5\u8be2<\/strong>
              \u5b50\u67e5\u8be2\u662f\u5d4c\u5957\u5728\u5176\u4ed6 SQL \u8bed\u53e5\u4e2d\u7684\u67e5\u8be2\uff0c\u53ef\u4ee5\u7528\u6765\u63d0\u4f9b\u67e5\u8be2\u6761\u4ef6\u6216\u4f5c\u4e3a\u5b57\u6bb5\u503c\u3002<\/li>\r\n\r\n\r\n\r\n
            • WHERE \u5b50\u67e5\u8be2<\/strong>\uff1a\u5b50\u67e5\u8be2\u4f5c\u4e3a\u6761\u4ef6\u4f7f\u7528\u3002 SELECT username, age FROM users WHERE age > (SELECT AVG(age) FROM users);<\/code><\/li>\r\n\r\n\r\n\r\n
            • IN \u5b50\u67e5\u8be2<\/strong>\uff1a\u5b50\u67e5\u8be2\u8fd4\u56de\u591a\u4e2a\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 IN<\/code> \u6765\u5339\u914d\u3002 SELECT username FROM users WHERE age IN (SELECT age FROM users WHERE username = 'john');<\/code><\/li>\r\n\r\n\r\n\r\n
            • EXISTS \u5b50\u67e5\u8be2<\/strong>\uff1a\u7528\u4e8e\u68c0\u67e5\u5b50\u67e5\u8be2\u662f\u5426\u8fd4\u56de\u7ed3\u679c\u3002
              sql SELECT username FROM users WHERE EXISTS (SELECT 1 FROM orders WHERE user_id = users.id);<\/code><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
              1.3. \u8054\u5408\u67e5\u8be2\uff08UNION\uff09<\/strong><\/h4>\r\n\r\n\r\n\r\n
                \r\n
              • UNION<\/strong>\uff1a\u5c06\u591a\u4e2a\u67e5\u8be2\u7684\u7ed3\u679c\u5408\u5e76\u4e3a\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u9ed8\u8ba4\u53bb\u91cd\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                  SELECT username FROM users WHERE age > 30\r\n  UNION\r\n  SELECT username FROM users WHERE age < 20;<\/code><\/pre>\r\n\r\n\r\n\r\n
                  \r\n
                • UNION ALL<\/strong>\uff1a\u5c06\u591a\u4e2a\u67e5\u8be2\u7684\u7ed3\u679c\u5408\u5e76\u4e3a\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u4e0d\u53bb\u91cd\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                    SELECT username FROM users WHERE age > 30\r\n  UNION ALL\r\n  SELECT username FROM users WHERE age < 20;<\/code><\/pre>\r\n\r\n\r\n\r\n
                  2. \u4e8b\u52a1\u4e0e\u9501\u673a\u5236<\/strong><\/h3>\r\n\r\n\r\n\r\n
                  2.1. \u4e8b\u52a1\u7ba1\u7406<\/strong><\/h4>\r\n\r\n\r\n\r\n
                  \u4e8b\u52a1\uff08Transaction\uff09\u662f\u4e00\u7ec4\u64cd\u4f5c\u7684\u96c6\u5408\uff0c\u5177\u6709\u539f\u5b50\u6027\uff08Atomicity\uff09\u3001\u4e00\u81f4\u6027\uff08Consistency\uff09\u3001\u9694\u79bb\u6027\uff08Isolation\uff09\u548c\u6301\u4e45\u6027\uff08Durability\uff09\uff0c\u7b80\u79f0 ACID \u7279\u6027\u3002MySQL \u9ed8\u8ba4\u4f7f\u7528 InnoDB \u5b58\u50a8\u5f15\u64ce\uff0c\u652f\u6301\u4e8b\u52a1\u3002<\/p>\r\n\r\n\r\n\r\n
                    \r\n
                  • \u5f00\u542f\u4e8b\u52a1<\/strong>\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                      START TRANSACTION;<\/code><\/pre>\r\n\r\n\r\n\r\n
                      \r\n
                    • \u63d0\u4ea4\u4e8b\u52a1<\/strong>\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                        COMMIT;<\/code><\/pre>\r\n\r\n\r\n\r\n
                        \r\n
                      • \u56de\u6eda\u4e8b\u52a1<\/strong>\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                          ROLLBACK;<\/code><\/pre>\r\n\r\n\r\n\r\n
                        \u4e8b\u52a1\u5e38\u7528\u4e8e\u4fdd\u8bc1\u591a\u6761 SQL \u8bed\u53e5\u6267\u884c\u7684\u539f\u5b50\u6027\uff0c\u5c24\u5176\u662f\u66f4\u65b0\u591a\u4e2a\u8868\u7684\u6570\u636e\u65f6\u3002\u82e5\u67d0\u6761\u8bed\u53e5\u6267\u884c\u5931\u8d25\uff0c\u53ef\u4ee5\u901a\u8fc7 ROLLBACK<\/code> \u64a4\u9500\u4e4b\u524d\u7684\u66f4\u6539\u3002<\/p>\r\n\r\n\r\n\r\n
                        2.2. \u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/strong><\/h4>\r\n\r\n\r\n\r\n
                        MySQL \u63d0\u4f9b\u4e86\u56db\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u6bcf\u4e2a\u7ea7\u522b\u5b9a\u4e49\u4e86\u4e8b\u52a1\u4e4b\u95f4\u7684\u53ef\u89c1\u6027\u548c\u5e76\u53d1\u63a7\u5236\uff1a<\/p>\r\n\r\n\r\n\r\n
                          \r\n
                        • READ UNCOMMITTED<\/strong>\uff1a\u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u53e6\u4e00\u4e2a\u672a\u63d0\u4ea4\u4e8b\u52a1\u7684\u6570\u636e\uff08\u810f\u8bfb\uff09\u3002<\/li>\r\n\r\n\r\n\r\n
                        • READ COMMITTED<\/strong>\uff1a\u4e8b\u52a1\u53ea\u80fd\u8bfb\u53d6\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u907f\u514d\u4e86\u810f\u8bfb\uff0c\u4f46\u4ecd\u7136\u53ef\u80fd\u53d1\u751f\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/li>\r\n\r\n\r\n\r\n
                        • REPEATABLE READ<\/strong>\uff1a\u4e8b\u52a1\u5728\u6574\u4e2a\u6267\u884c\u8fc7\u7a0b\u4e2d\u59cb\u7ec8\u8bfb\u53d6\u540c\u6837\u7684\u6570\u636e\uff0c\u907f\u514d\u4e86\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u53ef\u80fd\u53d1\u751f\u5e7b\u8bfb\u3002<\/li>\r\n\r\n\r\n\r\n
                        • SERIALIZABLE<\/strong>\uff1a\u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u901a\u8fc7\u5f3a\u5236\u52a0\u9501\u6765\u907f\u514d\u5e7b\u8bfb\uff0c\u4fdd\u8bc1\u4e8b\u52a1\u4e32\u884c\u6267\u884c\uff0c\u6027\u80fd\u8f83\u5dee\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                          \u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\r\n\r\n\r\n\r\n
                          SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;<\/code><\/pre>\r\n\r\n\r\n\r\n
                          2.3. \u9501\u673a\u5236<\/strong><\/h4>\r\n\r\n\r\n\r\n
                          MySQL \u652f\u6301\u591a\u79cd\u9501\uff0c\u4e3b\u8981\u5206\u4e3a\uff1a<\/p>\r\n\r\n\r\n\r\n
                            \r\n
                          • \u884c\u9501<\/strong>\uff1aInnoDB \u652f\u6301\u884c\u9501\uff0c\u53ef\u4ee5\u9501\u5b9a\u67d0\u4e00\u884c\u6570\u636e\uff0c\u5176\u4ed6\u4e8b\u52a1\u4ecd\u7136\u53ef\u4ee5\u64cd\u4f5c\u8868\u4e2d\u7684\u5176\u4ed6\u884c\u3002<\/li>\r\n\r\n\r\n\r\n
                          • \u8868\u9501<\/strong>\uff1aMyISAM \u548c InnoDB \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u4f7f\u7528\u8868\u9501\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u6574\u4e2a\u8868\u7684\u8bbf\u95ee\u53d7\u5230\u9650\u5236\uff0c\u6027\u80fd\u8f83\u5dee\u3002<\/li>\r\n\r\n\r\n\r\n
                          • \u6b7b\u9501<\/strong>\uff1a\u5f53\u4e24\u4e2a\u4e8b\u52a1\u76f8\u4e92\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u9501\u65f6\uff0c\u4f1a\u5bfc\u81f4\u6b7b\u9501\u3002MySQL \u4f1a\u81ea\u52a8\u68c0\u6d4b\u6b7b\u9501\u5e76\u56de\u6eda\u5176\u4e2d\u4e00\u4e2a\u4e8b\u52a1\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                            3. \u67e5\u8be2\u4f18\u5316\u4e0e\u7d22\u5f15\u4f7f\u7528<\/strong><\/h3>\r\n\r\n\r\n\r\n
                            3.1. \u7d22\u5f15\u7684\u4f5c\u7528\u4e0e\u4f18\u5316<\/strong><\/h4>\r\n\r\n\r\n\r\n
                            \u7d22\u5f15\u662f\u4e00\u79cd\u52a0\u901f\u6570\u636e\u5e93\u67e5\u8be2\u7684\u6280\u672f\uff0c\u5c24\u5176\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u67e5\u8be2\u6709\u663e\u8457\u5f71\u54cd\u3002\u901a\u8fc7\u521b\u5efa\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u5feb\u901f\u67e5\u627e\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\uff0c\u800c\u4e0d\u9700\u8981\u626b\u63cf\u6574\u4e2a\u8868\u3002<\/p>\r\n\r\n\r\n\r\n
                              \r\n
                            • \u521b\u5efa\u7d22\u5f15<\/strong>\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                CREATE INDEX idx_username ON users(username);<\/code><\/pre>\r\n\r\n\r\n\r\n
                                \r\n
                              • \u590d\u5408\u7d22\u5f15<\/strong>\uff1a\u5f53\u4f60\u7ecf\u5e38\u5728\u591a\u4e2a\u5217\u4e0a\u67e5\u8be2\u65f6\uff0c\u53ef\u4ee5\u521b\u5efa\u590d\u5408\u7d22\u5f15\uff08\u591a\u5217\u7d22\u5f15\uff09\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                  CREATE INDEX idx_username_email ON users(username, email);<\/code><\/pre>\r\n\r\n\r\n\r\n
                                  \r\n
                                • \u7d22\u5f15\u7684\u9009\u62e9<\/strong>\uff1a\u5728\u521b\u5efa\u7d22\u5f15\u65f6\uff0c\u5e94\u8be5\u6839\u636e\u67e5\u8be2\u7684\u9700\u8981\u6765\u9009\u62e9\u54ea\u4e9b\u5217\u9700\u8981\u7d22\u5f15\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u9009\u62e9\u9891\u7e41\u51fa\u73b0\u5728 WHERE<\/code> \u5b50\u53e5\u3001ORDER BY<\/code> \u548c JOIN<\/code> \u4e2d\u7684\u5217\u3002<\/li>\r\n\r\n\r\n\r\n
                                • \u67e5\u770b\u7d22\u5f15<\/strong>\uff1a<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                    SHOW INDEX FROM users;<\/code><\/pre>\r\n\r\n\r\n\r\n
                                  3.2. \u67e5\u8be2\u4f18\u5316\u6280\u5de7<\/strong><\/h4>\r\n\r\n\r\n\r\n
                                    \r\n
                                  • **\u907f\u514d SELECT ***\uff1a\u67e5\u8be2\u65f6\u5c3d\u91cf\u53ea\u9009\u62e9\u9700\u8981\u7684\u5217\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u4f20\u8f93\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                      SELECT username, email FROM users WHERE age > 30;<\/code><\/pre>\r\n\r\n\r\n\r\n
                                      \r\n
                                    • \u4f7f\u7528\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b<\/strong>\uff1a\u4e3a\u5217\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\uff0c\u907f\u514d\u5b58\u50a8\u8fc7\u5927\u7684\u6570\u636e\u3002\u4f8b\u5982\uff0cVARCHAR(255)<\/code> \u5bf9\u4e8e\u5927\u591a\u6570\u573a\u666f\u6765\u8bf4\u53ef\u80fd\u8fc7\u957f\uff0c\u5b9e\u9645\u4f7f\u7528\u65f6\u53ef\u4ee5\u8bbe\u7f6e\u5408\u9002\u7684\u957f\u5ea6\u3002<\/li>\r\n\r\n\r\n\r\n
                                    • \u907f\u514d\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6570<\/strong>\uff1a\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6570\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u4ece\u800c\u5bfc\u81f4\u5168\u8868\u626b\u63cf\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                        -- \u9519\u8bef\u7684\u7528\u6cd5\r\n  SELECT * FROM users WHERE YEAR(created_at) = 2023;\r\n\r\n  -- \u66f4\u597d\u7684\u65b9\u6cd5\r\n  SELECT * FROM users WHERE created_at BETWEEN '2023-01-01' AND '2023-12-31';<\/code><\/pre>\r\n\r\n\r\n\r\n
                                        \r\n
                                      • EXPLAIN \u5206\u6790\u67e5\u8be2<\/strong>\uff1a\u4f7f\u7528 EXPLAIN<\/code> \u6765\u5206\u6790\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u627e\u51fa\u6027\u80fd\u74f6\u9888\u3002<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
                                          EXPLAIN SELECT * FROM users WHERE age > 30;<\/code><\/pre>\r\n\r\n\r\n\r\n
                                        3.3. \u6162\u67e5\u8be2\u65e5\u5fd7<\/strong><\/h4>\r\n\r\n\r\n\r\n
                                        \u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\u53ef\u4ee5\u5e2e\u52a9\u4f60\u627e\u5230\u8fd0\u884c\u65f6\u95f4\u8f83\u957f\u7684\u67e5\u8be2\uff0c\u4ece\u800c\u8fdb\u884c\u4f18\u5316\u3002\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u4ee5\u4e0b\u53c2\u6570\u6765\u542f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\uff1a<\/p>\r\n\r\n\r\n\r\n
                                        SET GLOBAL slow_query_log = 1;\r\nSET GLOBAL long_query_time = 1;<\/code><\/pre>\r\n\r\n\r\n\r\n
                                        \u4ee5\u4e0a\u8bbe\u7f6e\u5c06\u8bb0\u5f55\u6240\u6709\u6267\u884c\u65f6\u95f4\u8d85\u8fc7 1 \u79d2\u7684\u67e5\u8be2\u3002<\/p>\r\n\r\n\r\n
                                        \r\n\r\n\r\n
                                        \u603b\u7ed3<\/h3>\r\n\r\n\r\n\r\n
                                        \u8fd9\u4e00\u90e8\u5206\u4e3b\u8981\u6db5\u76d6\u4e86 MySQL \u4e2d\u7684\u9ad8\u7ea7 SQL \u6280\u5de7\uff0c\u5305\u62ec\u590d\u6742\u67e5\u8be2\u3001\u4e8b\u52a1\u7ba1\u7406\u3001\u9501\u673a\u5236\u3001\u7d22\u5f15\u4f18\u5316\u548c\u67e5\u8be2\u4f18\u5316\u3002\u638c\u63e1\u8fd9\u4e9b\u5185\u5bb9\u5c06\u5e2e\u52a9\u4f60\u66f4\u9ad8\u6548\u5730\u4f7f\u7528 MySQL\uff0c\u5904\u7406\u66f4\u590d\u6742\u7684\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u5e76\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002<\/p>\r\n","protected":false},"excerpt":{"rendered":"
                                        \u7ee7\u7eed\u6df1\u5165\u5b66\u4e60\u7b2c\u4e8c\u90e8\u5206\uff0c\u8fdb\u9636 SQL \u4f7f\u7528\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u66f4\u9ad8\u7ea7\u7684 SQL \u6280\u5de7\uff0c\u5305\u62ec\u590d\u6742\u67e5\u8be2\u3001\u4e8b\u52a1\u7ba1\u7406\u3001\u9501\u673a\u5236 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-1635","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1635","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=1635"}],"version-history":[{"count":3,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1635\/revisions"}],"predecessor-version":[{"id":1651,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1635\/revisions\/1651"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}