{"id":76482,"date":"2024-10-16T07:02:14","date_gmt":"2024-10-15T23:02:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76482\/"},"modified":"2024-10-16T07:02:14","modified_gmt":"2024-10-15T23:02:14","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b0%8d%e8%b1%a1%e7%9a%842%e5%80%8b%e5%84%aa%e5%8c%96%e6%8a%80%e5%b7%a7%ef%bc%9a%e5%a0%b4%e6%99%af%e5%88%86%e6%9e%90%e3%80%813%e6%ad%a5%e4%bd%bf%e7%94%a8%e8%a9%b3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76482\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u5c0d\u8c61\u76842\u500b\u512a\u5316\u6280\u5de7\uff1a\u5834\u666f\u5206\u6790\u30013\u6b65\u4f7f\u7528\u8a73\u89e3\uff01"},"content":{"rendered":"

MySQL\u6578\u64da\u5eab\u5c0d\u8c61\u76842\u500b\u512a\u5316\u6280\u5de7\uff1a\u5834\u666f\u5206\u6790\u30013\u6b65\u4f7f\u7528\u8a73\u89e3\uff01<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5982\u4f55\u6709\u6548\u5730\u512a\u5316MySQL\u6578\u64da\u5eab\u6210\u70ba\u4e86\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u7684\u91cd\u8981\u8ab2\u984c\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5169\u500b\u512a\u5316\u6280\u5de7\uff0c\u4e26\u63d0\u4f9b\u5177\u9ad4\u7684\u5834\u666f\u5206\u6790\u548c\u4e09\u6b65\u4f7f\u7528\u8a73\u89e3\u3002<\/p>\n

\u512a\u5316\u6280\u5de7\u4e00\uff1a\u4f7f\u7528\u7d22\u5f15<\/h2>\n

\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u70ba\u8868\u4e2d\u7684\u4e00\u500b\u6216\u591a\u500b\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u7d22\u5f15\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n

\u5834\u666f\u5206\u6790<\/h3>\n

\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u5305\u542b\u7528\u6236\u7684ID\u3001\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u7576\u6211\u5011\u9700\u8981\u6839\u64da\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u67e5\u627e\u7528\u6236\u6642\uff0c\u5982\u679c\u6c92\u6709\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u5c07\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\uff0c\u9019\u5728\u6578\u64da\u91cf\u5927\u6642\u6703\u975e\u5e38\u8017\u6642\u3002<\/p>\n

\u4e09\u6b65\u4f7f\u7528\u8a73\u89e3<\/h3>\n
    \n
  1. \u5275\u5efa\u7d22\u5f15\uff1a<\/strong>\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u70ba\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u5275\u5efa\u7d22\u5f15\uff1a<\/li>\n
    CREATE INDEX idx_email ON users(email);<\/code><\/pre>\n
  2. \u57f7\u884c\u67e5\u8a62\uff1a<\/strong>\u4f7f\u7528\u7d22\u5f15\u5f8c\uff0c\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u5c07\u5229\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u627e\uff1a<\/li>\n
    SELECT * FROM users WHERE email = 'example@example.com';<\/code><\/pre>\n
  3. \u6aa2\u67e5\u6027\u80fd\uff1a<\/strong>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u4f86\u6aa2\u67e5\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u78ba\u4fdd\u7d22\u5f15\u88ab\u6b63\u78ba\u4f7f\u7528\uff1a<\/li>\n
    EXPLAIN SELECT * FROM users WHERE email = 'example@example.com';<\/code><\/pre>\n<\/ol>\n
    \u512a\u5316\u6280\u5de7\u4e8c\uff1a\u67e5\u8a62\u512a\u5316<\/h2>\n
    \u67e5\u8a62\u512a\u5316\u662f\u53e6\u4e00\u500b\u91cd\u8981\u7684\u512a\u5316\u6280\u5de7\u3002\u901a\u904e\u91cd\u69cb\u67e5\u8a62\u8a9e\u53e5\uff0c\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8ca0\u64d4\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
    \u5834\u666f\u5206\u6790<\/h3>\n
    \u5047\u8a2d\u6211\u5011\u9700\u8981\u5f9e\u4e00\u500b\u5305\u542b\u6578\u767e\u842c\u689d\u8a18\u9304\u7684\u8a02\u55ae\u8868\u4e2d\u67e5\u627e\u7279\u5b9a\u7528\u6236\u7684\u6240\u6709\u8a02\u55ae\u3002\u5982\u679c\u6211\u5011\u4f7f\u7528\u4e0d\u5fc5\u8981\u7684SELECT *\uff0c\u5c07\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u548c\u8655\u7406\u3002<\/p>\n
    \u4e09\u6b65\u4f7f\u7528\u8a73\u89e3<\/h3>\n
      \n
    1. \u9078\u64c7\u5fc5\u8981\u7684\u5217\uff1a<\/strong>\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u800c\u4e0d\u662f\u4f7f\u7528SELECT *\uff1a<\/li>\n
      SELECT order_id, order_date FROM orders WHERE user_id = 123;<\/code><\/pre>\n
    2. \u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\uff1a<\/strong>\u5982\u679c\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u6578\u64da\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff1a<\/li>\n
      SELECT o.order_id, o.order_date, u.name \nFROM orders o \nJOIN users u ON o.user_id = u.id \nWHERE u.id = 123;<\/code><\/pre>\n
    3. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u907f\u514d\u4f7f\u7528\u51fd\u6578\u6216\u8a08\u7b97\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8a08\u7b97\u8ca0\u64d4\uff1a<\/li>\n
      SELECT order_id, order_date \nFROM orders \nWHERE user_id = 123 AND order_date >= '2023-01-01';<\/code><\/pre>\n<\/ol>\n
      \u7e3d\u7d50<\/h2>\n
      \u901a\u904e\u4f7f\u7528\u7d22\u5f15\u548c\u67e5\u8a62\u512a\u5316\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u5920\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u80fd\u6e1b\u5c11\u7cfb\u7d71\u8cc7\u6e90\u7684\u6d88\u8017\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9019\u4e9b\u512a\u5316\u6280\u5de7\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n
      \u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u63d0\u4f9b\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u63a2\u7d22MySQL\u6578\u64da\u5eab\u5c0d\u8c61\u7684\u5169\u500b\u512a\u5316\u6280\u5de7\uff0c\u901a\u904e\u5834\u666f\u5206\u6790\u548c\u4e09\u6b65\u9a5f\u8a73\u89e3\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u548c\u6548\u7387\uff01<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-76482","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76482","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=76482"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76482\/revisions"}],"predecessor-version":[{"id":76483,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76482\/revisions\/76483"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}