{"id":441679,"date":"2025-05-23T09:32:14","date_gmt":"2025-05-23T01:32:14","guid":{"rendered":"https:\/\/www.idc.net\/help\/?p=441679"},"modified":"2025-05-23T09:32:14","modified_gmt":"2025-05-23T01:32:14","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90mysql%e7%b4%a2%e5%bc%95%e5%8e%9f%e7%90%86%e4%b8%8e%e4%bc%98%e5%8c%96%e7%ad%96%e7%95%a5%ef%bc%9a%e6%8f%90%e5%8d%87%e9%a6%99%e6%b8%af%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/441679\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790MySQL\u7d22\u5f15\u539f\u7406\u4e0e\u4f18\u5316\u7b56\u7565\uff1a\u63d0\u5347\u9999\u6e2f\u670d\u52a1\u5668\u6570\u636e\u5e93\u6027\u80fd\u7684\u5173\u952e"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h2>\u524d\u8a00<\/h2>\n<p>\u5728\u73b0\u4ee3\u6570\u636e\u5e93\u7ba1\u7406\u4e2d\uff0c<strong>\u7d22\u5f15\u673a\u5236<\/strong>\u7684\u4f18\u5316\u5bf9\u4e8e\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3001\u51cf\u5c11\u8d44\u6e90\u6d88\u8017\u5177\u6709\u4e3e\u8db3\u8f7b\u91cd\u7684\u4f5c\u7528\u3002\u5c24\u5176\u5728\u642d\u5efa\u9ad8\u6027\u80fd\u4e1a\u52a1\u7cfb\u7edf\u65f6\uff0c\u9009\u62e9\u6027\u80fd\u5f3a\u52b2\u7684\u670d\u52a1\u5668\u540c\u6837\u91cd\u8981\uff0c\u4f8b\u5982\u90e8\u7f72\u5728<strong>\u9999\u6e2fvps<\/strong>\u6216<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\u4e0a\u7684MySQL\u670d\u52a1\uff0c\u5728\u6b63\u786e\u7684\u7d22\u5f15\u8bbe\u8ba1\u52a0\u6301\u4e0b\uff0c\u80fd\u591f\u5927\u5e45\u63d0\u5347\u6574\u4f53\u54cd\u5e94\u901f\u5ea6\u3002\u672c\u6587\u5c06\u4ece\u7d22\u5f15\u57fa\u7840\u3001\u6570\u636e\u7ed3\u6784\u3001\u5206\u7c7b\u4e0e\u9ad8\u7ea7\u5e94\u7528\u56db\u5927\u65b9\u9762\u8fdb\u884c\u8be6\u89e3\uff0c\u5e76\u7ed3\u5408\u5b9e\u9645\u6848\u4f8b\u5e2e\u52a9\u6280\u672f\u4eba\u5458\u66f4\u9ad8\u6548\u5730\u6784\u5efa\u6570\u636e\u5e93\u7cfb\u7edf\u3002<\/p>\n<h2>\u7d22\u5f15\u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u79bb\u4e0d\u5f00\u5b83\uff1f<\/h2>\n<p>\u7b80\u5355\u6765\u8bf4\uff0cMySQL\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u8f85\u52a9\u6570\u636e\u5e93\u5feb\u901f\u5b9a\u4f4d\u8bb0\u5f55\u3002\u5f53\u8868\u4e2d\u7684\u6570\u636e\u91cf\u8fbe\u5230\u6570\u5341\u4e07\u751a\u81f3\u4e0a\u767e\u4e07\u884c\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u5408\u7406\u7684\u7d22\u5f15\uff0c\u6bcf\u6b21\u67e5\u8be2\u90fd\u9700\u8981\u4ece\u5934\u626b\u63cf\u6574\u5f20\u8868\uff0c\u6027\u80fd\u5c06\u6025\u5267\u4e0b\u964d\u3002<\/p>\n<p>\u4e3e\u4e2a\u751f\u6d3b\u4e2d\u7684\u4f8b\u5b50\uff1a\u67e5\u5b57\u5178\u65f6\u6211\u4eec\u901a\u5e38\u4f1a\u5229\u7528\u5b57\u6bcd\u987a\u5e8f\u53bb\u5feb\u901f\u5b9a\u4f4d\u5355\u8bcd\uff0c\u800c\u4e0d\u662f\u4ece\u7b2c\u4e00\u9875\u7ffb\u8d77\u3002MySQL\u7684\u7d22\u5f15\u539f\u7406\u4e5f\u662f\u5982\u6b64\uff0c\u501f\u52a9\u4e8e\u6392\u5e8f\u548c\u5206\u652f\u7ed3\u6784\uff0c\u5feb\u901f\u7f29\u5c0f\u67e5\u627e\u8303\u56f4\u3002<\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c<strong>\u7d22\u5f15\u8bbe\u8ba1\u4e0d\u5f53\u53cd\u800c\u53ef\u80fd\u62d6\u6162\u6027\u80fd<\/strong>\uff0c\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u78c1\u76d8IO\u5f00\u9500\u3002\u5c24\u5176\u5728<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\u8fd9\u7c7b\u9ad8\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u5408\u7406\u7684\u7d22\u5f15\u7ed3\u6784\u662f\u786e\u4fdd\u7a33\u5b9a\u8fd0\u884c\u7684\u5173\u952e\u3002<\/p>\n<h2>\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\uff1aB+\u6811\u63ed\u79d8<\/h2>\n<p>MySQL 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\u8054\u5408\u7d22\u5f15\u9075\u5faa\u201c\u6700\u5de6\u524d\u7f00\u5339\u914d\u201d\u539f\u5219\u3002\u6bd4\u5982\u7d22\u5f15\u5b9a\u4e49\u4e3a <code>(name, age)<\/code>\uff0c\u67e5\u8be2\u8bed\u53e5\u4e2d\u53ea\u8981\u5305\u542b\u4ece\u5de6\u81f3\u53f3\u8fde\u7eed\u5339\u914d\u7684\u5b57\u6bb5\uff0c\u5982 <code>WHERE name=\"\u5f20\u4e09\"<\/code> \u6216 <code>WHERE name=\"\u5f20\u4e09\" AND age=15<\/code>\uff0c\u90fd\u80fd\u6709\u6548\u5229\u7528\u8be5\u7d22\u5f15\u3002\u82e5\u8df3\u8fc7\u4e2d\u95f4\u5b57\u6bb5\u5982 <code>WHERE age=15<\/code> \u5219\u65e0\u6cd5\u751f\u6548\u3002<\/p>\n<h3>\u7d22\u5f15\u4e0b\u63a8\u4e0e\u8986\u76d6\u7d22\u5f15<\/h3>\n<p>\u5728MySQL 5.6\u4ee5\u540e\uff0c\u5f15\u5165\u4e86 <strong>\u7d22\u5f15\u4e0b\u63a8\uff08Index Condition Pushdown\uff09<\/strong> \u6280\u672f\uff0c\u5141\u8bb8\u5728\u904d\u5386\u7d22\u5f15\u9636\u6bb5\u5c31\u8fdb\u884c\u90e8\u5206\u8fc7\u6ee4\u6761\u4ef6\u5224\u65ad\uff0c\u4ece\u800c\u51cf\u5c11\u56de\u8868\u6b21\u6570\u3002\u6b64\u5916\uff0c<strong>\u8986\u76d6\u7d22\u5f15<\/strong> \u662f\u4e00\u79cd\u53ef\u4ee5\u5b8c\u5168\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u7d22\u5f15\u7ed3\u6784\uff0c\u6bd4\u5982 <code>(a, b)<\/code> \u7684\u8054\u5408\u7d22\u5f15\uff0c\u5728\u67e5\u8be2 <code>SELECT b FROM table WHERE a=xxx<\/code> 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\u8bc6\u522b\u6162SQL\uff0c\u5bf9\u5e94\u4f18\u5316\u7d22\u5f15\u7ed3\u6784\u3002<\/li>\n<\/ol>\n<p>\u7279\u522b\u662f\u5728\u4f7f\u7528<strong>\u9999\u6e2f\u72ec\u7acb\u670d\u52a1\u5668<\/strong>\u642d\u5efa\u6570\u636e\u5e93\u670d\u52a1\u65f6\uff0c\u642d\u914d\u5408\u9002\u7684\u7d22\u5f15\u65b9\u6848\uff0c\u4e0d\u4ec5\u80fd\u8282\u7701IO\u8d44\u6e90\uff0c\u8fd8\u80fd\u91ca\u653e\u66f4\u591a\u8ba1\u7b97\u8d44\u6e90\u7ed9\u4e1a\u52a1\u903b\u8f91\u5904\u7406\uff0c\u6781\u5927\u63d0\u9ad8\u6574\u4f53\u541e\u5410\u91cf\u3002<\/p>\n<h2>\u7ed3\u8bed<\/h2>\n<p>\u638c\u63e1MySQL\u7d22\u5f15\u539f\u7406\uff0c\u4e0d\u4ec5\u6709\u52a9\u4e8e\u89e3\u51b3\u67e5\u8be2\u6027\u80fd\u74f6\u9888\uff0c\u66f4\u80fd\u4e3a\u6574\u4e2a\u7cfb\u7edf\u7684\u53ef\u6269\u5c55\u6027\u6253\u4e0b\u575a\u5b9e\u57fa\u7840\u3002\u968f\u7740\u4e1a\u52a1\u9700\u6c42\u7684\u589e\u52a0\uff0c\u90e8\u7f72\u5728\u9ad8\u6027\u80fd\u8282\u70b9\u4e0a\u7684\u6570\u636e\u5e93\uff0c\u6bd4\u5982<a href=\"https:\/\/idc.net\/\"><strong>\u9999\u6e2fvps<\/strong><\/a>\u6216<strong>\u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/strong>\uff0c\u642d\u914d\u5408\u7406\u7d22\u5f15\u8bbe\u8ba1\uff0c\u53ef\u4ee5\u663e\u8457\u964d\u4f4e\u8bbf\u95ee\u5ef6\u8fdf\u3001\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; \u524d\u8a00 \u5728\u73b0\u4ee3\u6570\u636e\u5e93\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u673a\u5236\u7684\u4f18\u5316\u5bf9\u4e8e\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3001\u51cf\u5c11\u8d44\u6e90\u6d88\u8017\u5177\u6709\u4e3e\u8db3\u8f7b\u91cd\u7684\u4f5c\u7528\u3002\u5c24\u5176\u5728 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-441679","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/441679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=441679"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/441679\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=441679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=441679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=441679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}