{"id":200022,"date":"2025-05-06T10:44:14","date_gmt":"2025-05-06T02:44:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200022\/"},"modified":"2025-05-06T10:44:14","modified_gmt":"2025-05-06T02:44:14","slug":"%e5%9c%a8mysql%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bc%98%e5%8c%96%e7%b4%a2%e5%bc%95%e5%89%8d%e7%bc%80%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200022\/","title":{"rendered":"\u5728MySQL\u4e2d\u5982\u4f55\u4f18\u5316\u7d22\u5f15\u524d\u7f00\uff1f"},"content":{"rendered":"

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

\u5728MySQL\u4e2d\u5982\u4f55\u4f18\u5316\u7d22\u5f15\u524d\u7f00\uff1f<\/h1>\n

\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n

\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\uff1f<\/p>\n

MySQL\u662f\u4e00\u6b3e\u975e\u5e38\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5b83\u652f\u6301\u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u6570\u636e\u5e93\u8868\u4e2d\u7684\u5217\u5177\u6709\u8f83\u957f\u7684\u503c\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u6765\u51cf\u5c11\u7d22\u5f15\u7684\u5927\u5c0f\u5e76\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

\u4ec0\u4e48\u662f\u524d\u7f00\u7d22\u5f15\uff1f<\/h2>\n

\u524d\u7f00\u7d22\u5f15\u662f\u6307\u5bf9\u5217\u503c\u7684\u524d\u7f00\u8fdb\u884c\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u5217\u503c\u3002\u901a\u8fc7\u53ea\u7d22\u5f15\u5217\u503c\u7684\u524d\u51e0\u4e2a\u5b57\u7b26\uff0c\u53ef\u4ee5\u51cf\u5c11\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u5e76\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u524d\u7f00\u7d22\u5f15\u9002\u7528\u4e8e\u5217\u503c\u8f83\u957f\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u6587\u672c\u7c7b\u578b\u7684\u5217\u3002<\/p>\n

\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\uff1f<\/h2>\n

\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u6307\u5b9a\u524d\u7f00\u957f\u5ea6\u6765\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3ausers<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a\u540d\u4e3aname<\/code>\u7684\u5217\uff0c\u6211\u4eec\u5e0c\u671b\u5bf9name<\/code>\u5217\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u3002<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u524d\u7f00\u7d22\u5f15\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bDDL\u8bed\u53e5\u6765\u521b\u5efa\u4e00\u4e2a\u524d\u7f00\u7d22\u5f15\uff1a<\/p>\n

CREATE INDEX idx_name_prefix ON users (name(10));<\/pre>\n
\u5728\u4e0a\u9762\u7684DDL\u8bed\u53e5\u4e2d\uff0cidx_name_prefix<\/code>\u662f\u7d22\u5f15\u7684\u540d\u79f0\uff0cusers<\/code>\u662f\u8868\u7684\u540d\u79f0\uff0cname<\/code>\u662f\u8981\u521b\u5efa\u7d22\u5f15\u7684\u5217\uff0c(10)<\/code>\u8868\u793a\u6211\u4eec\u53ea\u7d22\u5f15name<\/code>\u5217\u7684\u524d10\u4e2a\u5b57\u7b26\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\u6765\u9a8c\u8bc1\u7d22\u5f15\u662f\u5426\u751f\u6548\uff1a<\/p>\n
EXPLAIN SELECT * FROM users WHERE name LIKE 'A%';<\/pre>\n
\u5728\u4e0a\u9762\u7684\u67e5\u8be2\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86LIKE<\/code>\u64cd\u4f5c\u7b26\u6765\u67e5\u8be2\u4ee5\u5b57\u6bcd”A”\u5f00\u5934\u7684name<\/code>\u503c\u3002\u901a\u8fc7EXPLAIN<\/code>\u5173\u952e\u5b57\uff0c\u6211\u4eec\u53ef\u4ee5\u67e5\u770bMySQL\u7684\u6267\u884c\u8ba1\u5212\uff0c\u786e\u4fdd\u7d22\u5f15\u88ab\u6b63\u786e\u5730\u4f7f\u7528\u3002<\/p>\n
\u6ce8\u610f\u4e8b\u9879<\/h2>\n
    \n
  • \u524d\u7f00\u7d22\u5f15\u53ef\u4ee5\u51cf\u5c11\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u4e5f\u4f1a\u5e26\u6765\u4e00\u4e9b\u9650\u5236\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u7d22\u5f15\u7684\u524d\u7f00\u957f\u5ea6\u8fc7\u77ed\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\uff0c\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n
  • \u5728\u9009\u62e9\u524d\u7f00\u957f\u5ea6\u65f6\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u60c5\u51b5\u8fdb\u884c\u6743\u8861\u3002\u901a\u5e38\u53ef\u4ee5\u6839\u636e\u6570\u636e\u5206\u5e03\u60c5\u51b5\u548c\u67e5\u8be2\u9700\u6c42\u6765\u786e\u5b9a\u5408\u9002\u7684\u524d\u7f00\u957f\u5ea6\u3002<\/li>\n
  • \u524d\u7f00\u7d22\u5f15\u53ef\u80fd\u4f1a\u5bfc\u81f4\u67e5\u8be2\u4e0d\u8fd4\u56de\u5168\u90e8\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u3002\u56e0\u4e3a\u53ea\u5bf9\u90e8\u5206\u5217\u503c\u5efa\u7acb\u4e86\u7d22\u5f15\uff0c\u53ef\u80fd\u5b58\u5728\u6f0f\u6389\u4e00\u4e9b\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u7684\u60c5\u51b5\u3002<\/li>\n<\/ul>\n
    \u603b\u7ed3<\/h2>\n
    \u5728MySQL\u4e2d\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u662f\u4e00\u79cd\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u7684\u65b9\u5f0f\uff0c\u7279\u522b\u9002\u7528\u4e8e\u5217\u503c\u8f83\u957f\u7684\u60c5\u51b5\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u524d\u7f00\u957f\u5ea6\u548c\u521b\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5efa\u8bae\u6839\u636e\u5177\u4f53\u60c5\u51b5\u7efc\u5408\u8003\u8651\u662f\u5426\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\uff0c\u4ee5\u8fbe\u5230\u6700\u4f73\u7684\u6027\u80fd\u4f18\u5316\u6548\u679c\u3002<\/p>\n
    \u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    \u5728MySQL\u4e2d\u5982\u4f55\u4f18\u5316\u7d22\u5f15\u524d\u7f00\uff1f...<\/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-200022","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200022","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=200022"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200022\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}