{"id":188982,"date":"2024-11-12T03:32:20","date_gmt":"2024-11-11T19:32:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188982\/"},"modified":"2024-11-12T03:32:22","modified_gmt":"2024-11-11T19:32:22","slug":"%e6%8f%90%e9%ab%98order-by%e8%aa%9e%e5%8f%a5%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87%e7%9a%84%e5%85%a9%e5%80%8b%e6%80%9d%e8%b7%af","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188982\/","title":{"rendered":"\u63d0\u9ad8Order by\u8a9e\u53e5\u67e5\u8a62\u6548\u7387\u7684\u5169\u500b\u601d\u8def"},"content":{"rendered":"<h1 id=\"%e6%8f%90%e9%ab%98order-by%e8%aa%9e%e5%8f%a5%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87%e7%9a%84%e5%85%a9%e5%80%8b%e6%80%9d%e8%b7%af-oXOgXGmMOI\">\u63d0\u9ad8Order by\u8a9e\u53e5\u67e5\u8a62\u6548\u7387\u7684\u5169\u500b\u601d\u8def<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c<code>ORDER BY<\/code>\u8a9e\u53e5\u662f\u7528\u4f86\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u7684\u91cd\u8981\u5de5\u5177\u3002\u7136\u800c\uff0c\u7576\u6578\u64da\u91cf\u9f90\u5927\u6642\uff0c<code>ORDER BY<\/code>\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\uff0c\u5c0e\u81f4\u67e5\u8a62\u901f\u5ea6\u8b8a\u6162\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u63d0\u9ad8<code>ORDER BY<\/code>\u8a9e\u53e5\u67e5\u8a62\u6548\u7387\u7684\u5169\u500b\u601d\u8def\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%80%9d%e8%b7%af%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-oXOgXGmMOI\">\u601d\u8def\u4e00\uff1a\u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u95dc\u9375\u5de5\u5177\u4e4b\u4e00\u3002\u7576\u5c0d\u67d0\u500b\u5b57\u6bb5\u9032\u884c<code>ORDER BY<\/code>\u6392\u5e8f\u6642\uff0c\u5982\u679c\u8a72\u5b57\u6bb5\u4e0a\u6709\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95-oXOgXGmMOI\">\u5982\u4f55\u5275\u5efa\u7d22\u5f15<\/h3>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_column_name ON table_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\uff0c\u4e26\u5e0c\u671b\u6839\u64da<code>last_name<\/code>\u5b57\u6bb5\u9032\u884c\u6392\u5e8f\uff0c\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_last_name ON employees (last_name);<\/code><\/pre>\n<p>\u6709\u4e86\u7d22\u5f15\u5f8c\uff0c\u7576\u57f7\u884c\u4ee5\u4e0b\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u5c07\u80fd\u5920\u66f4\u5feb\u5730\u8fd4\u56de\u7d50\u679c\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY last_name;<\/code><\/pre>\n<h3 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-oXOgXGmMOI\">\u6ce8\u610f\u4e8b\u9805<\/h3>\n<p>\u96d6\u7136\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u6703\u589e\u52a0\u6578\u64da\u5eab\u7684\u5beb\u5165\u6210\u672c\u3002\u56e0\u6b64\uff0c\u5728\u5275\u5efa\u7d22\u5f15\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u5408\u7406\u898f\u5283\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u640d\u8017\u3002<\/p>\n<h2 id=\"%e6%80%9d%e8%b7%af%e4%ba%8c%ef%bc%9a%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c%e9%9b%86-oXOgXGmMOI\">\u601d\u8def\u4e8c\uff1a\u9650\u5236\u67e5\u8a62\u7d50\u679c\u96c6<\/h2>\n<p>\u53e6\u4e00\u7a2e\u63d0\u9ad8<code>ORDER BY<\/code>\u67e5\u8a62\u6548\u7387\u7684\u65b9\u6cd5\u662f\u9650\u5236\u67e5\u8a62\u7d50\u679c\u96c6\u7684\u5927\u5c0f\u3002\u7576\u67e5\u8a62\u7684\u6578\u64da\u91cf\u904e\u5927\u6642\uff0c\u6392\u5e8f\u64cd\u4f5c\u7684\u958b\u92b7\u4e5f\u6703\u96a8\u4e4b\u589e\u52a0\u3002\u901a\u904e\u4f7f\u7528<code>LIMIT<\/code>\u8a9e\u53e5\uff0c\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u9700\u8981\u6392\u5e8f\u7684\u6578\u64da\u91cf\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8limit%e7%9a%84%e7%a4%ba%e4%be%8b-oXOgXGmMOI\">\u4f7f\u7528LIMIT\u7684\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5f9e<code>employees<\/code>\u8868\u4e2d\u7372\u53d6\u6309<code>salary<\/code>\u5b57\u6bb5\u6392\u5e8f\u7684\u524d10\u540d\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY salary DESC LIMIT 10;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6578\u64da\u5eab\u53ea\u9700\u5c0d\u524d10\u689d\u8a18\u9304\u9032\u884c\u6392\u5e8f\uff0c\u5f9e\u800c\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"%e7%b5%90%e5%90%88%e7%b4%a2%e5%bc%95%e5%92%8climit-oXOgXGmMOI\">\u7d50\u5408\u7d22\u5f15\u548cLIMIT<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u7d50\u5408\u4f7f\u7528\u7d22\u5f15\u548c<code>LIMIT<\/code>\u53ef\u4ee5\u9054\u5230\u6700\u4f73\u6548\u679c\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e00\u500b\u5927\u578b\u6578\u64da\u96c6\uff0c\u9996\u5148\u5275\u5efa\u7d22\u5f15\uff0c\u7136\u5f8c\u4f7f\u7528<code>LIMIT<\/code>\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-oXOgXGmMOI\">\u7e3d\u7d50<\/h2>\n<p>\u63d0\u9ad8<code>ORDER BY<\/code>\u8a9e\u53e5\u67e5\u8a62\u6548\u7387\u7684\u5169\u500b\u4e3b\u8981\u601d\u8def\u662f\u4f7f\u7528\u7d22\u5f15\u548c\u9650\u5236\u67e5\u8a62\u7d50\u679c\u96c6\u3002\u901a\u904e\u5408\u7406\u5730\u8a2d\u8a08\u7d22\u5f15\u548c\u4f7f\u7528<code>LIMIT<\/code>\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u512a\u5316\u6578\u64da\u5eab\u67e5\u8a62\u6027\u80fd\uff0c\u5f9e\u800c\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684<code>VPS<\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u5982<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\uff0c\u4e5f\u80fd\u9032\u4e00\u6b65\u63d0\u5347\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u63d0\u9ad8Order by\u8a9e\u53e5\u67e5\u8a62\u6548\u7387\u7684\u5169\u500b\u6709\u6548\u601d\u8def\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u63d0\u5347\u67e5\u8a62\u901f\u5ea6\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-188982","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188982","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=188982"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188982\/revisions"}],"predecessor-version":[{"id":188983,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188982\/revisions\/188983"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}