{"id":199720,"date":"2025-05-06T09:13:43","date_gmt":"2025-05-06T01:13:43","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199720\/"},"modified":"2025-05-06T09:13:43","modified_gmt":"2025-05-06T01:13:43","slug":"%e9%87%8d%e8%a6%81%e6%80%a7%e5%92%8c%e5%ae%9a%e4%b9%89%ef%bc%9amysql%e6%95%b4%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199720\/","title":{"rendered":"\u91cd\u8981\u6027\u548c\u5b9a\u4e49\uff1aMySQL\u6574\u7406"},"content":{"rendered":"

<\/b> <\/p>\n

\u91cd\u8981\u6027\u548c\u5b9a\u4e49\uff1aMySQL\u6574\u7406<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\uff0c\u5982\u679c\u4f60\u5bf9\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n

MySQL\u6574\u7406\u7684\u5b9a\u4e49\u53ca\u91cd\u8981\u6027<\/p>\n

MySQL\u662f\u4e00\u79cd\u5f00\u6e90\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u7531\u745e\u5178MySQL AB\u516c\u53f8\u5f00\u53d1\uff0c\u540e\u88abSun\u516c\u53f8\u6536\u8d2d\uff0c\u73b0\u5728\u662fOracle\u516c\u53f8\u7684\u4ea7\u54c1\u3002MySQL\u5e7f\u6cdb\u5e94\u7528\u4e8eWeb\u5e94\u7528\u7a0b\u5e8f\u548c\u5927\u578b\u4f01\u4e1a\u7ea7\u6570\u636e\u5e93\u7cfb\u7edf\u3002\u5728\u4f7f\u7528MySQL\u8fdb\u884c\u6570\u636e\u5e93\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u6574\u7406\u6570\u636e\u662f\u4e00\u9879\u81f3\u5173\u91cd\u8981\u7684\u5de5\u4f5c\u3002\u672c\u6587\u5c06\u4ecb\u7ecdMySQL\u6574\u7406\u7684\u5b9a\u4e49\u53ca\u91cd\u8981\u6027\uff0c\u4ee5\u53ca\u63d0\u4f9b\u4e00\u4e9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

MySQL\u6574\u7406\uff0c\u7b80\u800c\u8a00\u4e4b\u5c31\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u903b\u8f91\u6216\u7269\u7406\u4e0a\u7684\u91cd\u65b0\u6392\u5217\u548c\u6e05\u7406\u5de5\u4f5c\u3002\u8fd9\u662f\u6570\u636e\u5e93\u7ba1\u7406\u548c\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u81f3\u5173\u91cd\u8981\u7684\u4e00\u73af\uff0c\u5b83\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6027\u80fd\u3001\u53ef\u9760\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u8fc7\u6574\u7406\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u6570\u636e\u5e93\u7ed3\u6784\u66f4\u52a0\u6e05\u6670\u3001\u9ad8\u6548\uff0c\u51cf\u5c11\u5197\u4f59\u6570\u636e\uff0c\u5e76\u4e14\u65b9\u4fbf\u540e\u7eed\u7684\u6570\u636e\u67e5\u8be2\u548c\u5206\u6790\u5de5\u4f5c\u3002<\/p>\n

\u5728MySQL\u4e2d\uff0c\u6570\u636e\u5e93\u6574\u7406\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n

    \n
  1. \u6570\u636e\u5e93\u8bbe\u8ba1\uff1a\u8bbe\u8ba1\u5408\u7406\u7684\u6570\u636e\u5e93\u7ed3\u6784\uff0c\u5305\u62ec\u8868\u7684\u7ed3\u6784\u3001\u5b57\u6bb5\u7684\u7c7b\u578b\u548c\u7d22\u5f15\u7684\u521b\u5efa\u7b49\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6548\u7387\u548c\u6027\u80fd\u3002<\/li>\n
  2. \u6570\u636e\u6e05\u7406\uff1a\u6e05\u7406\u65e0\u6548\u6570\u636e\u3001\u91cd\u590d\u6570\u636e\u4ee5\u53ca\u4e0d\u7b26\u5408\u89c4\u8303\u7684\u6570\u636e\uff0c\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002<\/li>\n
  3. \u6570\u636e\u4f18\u5316\uff1a\u5bf9\u67e5\u8be2\u548c\u64cd\u4f5c\u9891\u7e41\u7684\u6570\u636e\u8fdb\u884c\u4f18\u5316\uff0c\u5305\u62ec\u4f7f\u7528\u7d22\u5f15\u3001\u5408\u7406\u8bbe\u8ba1SQL\u8bed\u53e5\u7b49\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u54cd\u5e94\u901f\u5ea6\u3002<\/li>\n
  4. \u6570\u636e\u5907\u4efd\uff1a\u5b9a\u671f\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u5907\u4efd\uff0c\u907f\u514d\u6570\u636e\u4e22\u5931\u6216\u635f\u574f\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u5b89\u5168\u6027\u3002<\/li>\n<\/ol>\n

    \u4e0b\u9762\u6211\u4eec\u6765\u770b\u4e00\u4e9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n

      \n
    1. \u521b\u5efa\u7d22\u5f15\uff1a<\/li>\n<\/ol>\n
      CREATE INDEX idx_name ON table_name(column_name);<\/pre>\n
      \u8fd9\u6761\u8bed\u53e5\u5c06\u5728\u8868table_name\u7684\u5217column_name\u4e0a\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aidx_name\u7684\u7d22\u5f15\uff0c\u52a0\u5feb\u6570\u636e\u67e5\u8be2\u7684\u901f\u5ea6\u3002<\/p>\n
        \n
      1. \u5220\u9664\u91cd\u590d\u6570\u636e\uff1a<\/li>\n<\/ol>\n
        DELETE FROM table_name\nWHERE id IN (\n    SELECT id\n    FROM (\n        SELECT id, ROW_NUMBER() OVER (PARTITION BY column_name ORDER BY id) AS row_num\n        FROM table_name\n    ) t\n    WHERE t.row_num > 1\n);<\/pre>\n
        \u8fd9\u6bb5SQL\u8bed\u53e5\u4f1a\u5220\u9664\u8868table_name\u4e2d\u7684\u91cd\u590d\u6570\u636e\uff0c\u4ec5\u4fdd\u7559\u6bcf\u4e2acolumn_name\u5b57\u6bb5\u503c\u6700\u5c0f\u7684\u6570\u636e\u3002<\/p>\n
          \n
        1. \u4f18\u5316\u67e5\u8be2\u8bed\u53e5\uff1a<\/li>\n<\/ol>\n
          EXPLAIN SELECT * FROM table_name WHERE column_name = 'value';<\/pre>\n
          \u4f7f\u7528EXPLAIN\u5173\u952e\u5b57\u53ef\u4ee5\u67e5\u770b\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u6709\u52a9\u4e8e\u4f18\u5316\u67e5\u8be2\u6548\u7387\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u6027\u80fd\u3002<\/p>\n
          \u7efc\u4e0a\u6240\u8ff0\uff0cMySQL\u6574\u7406\u662f\u6570\u636e\u5e93\u7ba1\u7406\u548c\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u73af\uff0c\u5b83\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6027\u80fd\u3001\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u8fc7\u5408\u7406\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u3001\u6570\u636e\u6e05\u7406\u3001\u6570\u636e\u4f18\u5316\u548c\u6570\u636e\u5907\u4efd\uff0c\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u7a33\u5b9a\u8fd0\u884c\uff0c\u5e76\u4e3a\u540e\u7eed\u7684\u6570\u636e\u64cd\u4f5c\u548c\u5206\u6790\u5de5\u4f5c\u5960\u5b9a\u826f\u597d\u7684\u57fa\u7840\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u7406\u89e3MySQL\u6574\u7406\u7684\u5b9a\u4e49\u53ca\u91cd\u8981\u6027\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
          \u4eca\u5929\u5173\u4e8e\u300a\u91cd\u8981\u6027\u548c\u5b9a\u4e49\uff1aMySQL\u6574\u7406\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5b9a\u4e49,\u91cd\u8981\u6027,\u7f16\u7a0bMySQL\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n
          \n
          \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
          \u91cd\u8981\u6027\u548c\u5b9a\u4e49\uff1aMySQL\u6574\u7406 \u5927...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199720","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199720"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199720\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}