{"id":180960,"date":"2024-11-09T14:37:16","date_gmt":"2024-11-09T06:37:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180960\/"},"modified":"2024-11-09T14:37:17","modified_gmt":"2024-11-09T06:37:17","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3mysql%e5%be%aa%e7%92%b0%e6%9f%a5%e8%a9%a2%ef%bc%8c%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87-mysql%e5%be%aa%e7%92%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180960\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3MySQL\u5faa\u74b0\u67e5\u8a62\uff0c\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387 (mysql\u5faa\u74b0\u67e5\u8a62\u6578\u64da\u5eab\u6578\u64da\u5eab\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 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id=\"%e5%be%aa%e7%92%b0%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-zWaCIMfggY\">\u5faa\u74b0\u67e5\u8a62\u7684\u6027\u80fd\u554f\u984c<\/h2>\n<p>\u5faa\u74b0\u67e5\u8a62\u7684\u4e3b\u8981\u6027\u80fd\u554f\u984c\u5728\u65bc\u5b83\u6703\u5c0e\u81f4\u591a\u6b21\u7684\u6578\u64da\u5eab\u8a2a\u554f\u3002\u6bcf\u6b21\u5faa\u74b0\u90fd\u9700\u8981\u767c\u9001\u4e00\u500b\u67e5\u8a62\u8acb\u6c42\uff0c\u9019\u6703\u589e\u52a0\u6578\u64da\u5eab\u7684\u8ca0\u64d4\uff0c\u4e26\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u5ef6\u9072\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6027\u80fd\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u9ad8\u5ef6\u9072\uff1a<\/strong>\u6bcf\u6b21\u67e5\u8a62\u90fd\u9700\u8981\u7b49\u5f85\u6578\u64da\u5eab\u7684\u97ff\u61c9\uff0c\u9019\u6703\u5c0e\u81f4\u6574\u9ad4\u67e5\u8a62\u6642\u9593\u589e\u52a0\u3002<\/li>\n<li><strong>\u8cc7\u6e90\u6d88\u8017\uff1a<\/strong>\u591a\u6b21\u67e5\u8a62\u6703\u6d88\u8017\u66f4\u591a\u7684CPU\u548c\u5167\u5b58\u8cc7\u6e90\uff0c\u5f71\u97ff\u5176\u4ed6\u67e5\u8a62\u7684\u6027\u80fd\u3002<\/li>\n<li><strong>\u9396\u5b9a\u554f\u984c\uff1a<\/strong>\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e0b\uff0c\u5faa\u74b0\u67e5\u8a62\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u5eab\u9396\u5b9a\uff0c\u9032\u4e00\u6b65\u964d\u4f4e\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%84%aa%e5%8c%96%e5%be%aa%e7%92%b0%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%96%b9%e6%b3%95-zWaCIMfggY\">\u512a\u5316\u5faa\u74b0\u67e5\u8a62\u7684\u65b9\u6cd5<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8MySQL\u7684\u67e5\u8a62\u6548\u7387\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u512a\u5316\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8join%e8%aa%9e%e5%8f%a5-zWaCIMfggY\">1. \u4f7f\u7528JOIN\u8a9e\u53e5<\/h3>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u8a9e\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u66ff\u4ee3\u5faa\u74b0\u67e5\u8a62\u3002JOIN\u8a9e\u53e5\u5141\u8a31\u5728\u55ae\u500b\u67e5\u8a62\u4e2d\u540c\u6642\u6aa2\u7d22\u591a\u500b\u8868\u7684\u6578\u64da\uff0c\u5f9e\u800c\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8a2a\u554f\u6b21\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT users.id, users.name, orders.order_id \nFROM users \nJOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u4e00\u6b21\u6027\u7372\u53d6\u6240\u6709\u7528\u6236\u53ca\u5176\u8a02\u55ae\uff0c\u800c\u4e0d\u9700\u8981\u5728\u5faa\u74b0\u4e2d\u591a\u6b21\u67e5\u8a62\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2-zWaCIMfggY\">2. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u4e5f\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u5b50\u67e5\u8a62\u5141\u8a31\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\uff0c\u5f9e\u800c\u6e1b\u5c11\u5faa\u74b0\u7684\u9700\u8981\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT id, name \nFROM users \nWHERE id IN (SELECT user_id FROM orders);<\/code><\/pre>\n<h3 id=\"3-%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-zWaCIMfggY\">3. \u7d22\u5f15\u7684\u4f7f\u7528<\/h3>\n<p>\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u78ba\u4fdd\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u53ef\u4ee5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_user_id ON orders(user_id);<\/code><\/pre>\n<h3 id=\"4-%e6%89%b9%e9%87%8f%e8%99%95%e7%90%86-zWaCIMfggY\">4. \u6279\u91cf\u8655\u7406<\/h3>\n<p>\u5982\u679c\u5fc5\u9808\u4f7f\u7528\u5faa\u74b0\u67e5\u8a62\uff0c\u8003\u616e\u5c07\u67e5\u8a62\u5408\u4f75\u70ba\u6279\u91cf\u8655\u7406\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u8207\u6578\u64da\u5eab\u7684\u4ea4\u4e92\u6b21\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c07\u591a\u500b\u63d2\u5165\u64cd\u4f5c\u5408\u4f75\u70ba\u4e00\u500b\u6279\u91cf\u63d2\u5165\u64cd\u4f5c\uff1a<\/p>\n<pre><code>INSERT INTO orders (user_id, order_id) VALUES \n(1, 'A1'), \n(2, 'A2'), \n(3, 'A3');<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-zWaCIMfggY\">\u7e3d\u7d50<\/h2>\n<p>\u5faa\u74b0\u67e5\u8a62\u5728MySQL\u4e2d\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u4f46\u901a\u904e\u4f7f\u7528JOIN\u8a9e\u53e5\u3001\u5b50\u67e5\u8a62\u3001\u7d22\u5f15\u548c\u6279\u91cf\u8655\u7406\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u512a\u5316\u67e5\u8a62\u6548\u7387\u3002\u4e86\u89e3\u9019\u4e9b\u512a\u5316\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u9084\u80fd\u6539\u5584\u6574\u9ad4\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u901f\u5ea6\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<em><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/em>\u6216<em><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/em>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u7406\u89e3MySQL\u5faa\u74b0\u67e5\u8a62\uff0c\u638c\u63e1\u512a\u5316\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\uff0c\u8b93\u6578\u64da\u8655\u7406\u66f4\u5feb\u901f\u3001\u6d41\u66a2\u3002<\/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-180960","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180960","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=180960"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180960\/revisions"}],"predecessor-version":[{"id":180961,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180960\/revisions\/180961"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=180960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=180960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=180960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}