{"id":59539,"date":"2024-10-12T22:47:18","date_gmt":"2024-10-12T14:47:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/59539\/"},"modified":"2024-10-12T22:47:18","modified_gmt":"2024-10-12T14:47:18","slug":"case-when-end%e6%a2%9d%e4%bb%b6%e5%92%8c%e5%8c%af%e7%b8%bd%e5%87%bd%e6%95%b8sum%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8%e5%af%a6%e7%8f%be%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/59539\/","title":{"rendered":"CASE WHEN END\u689d\u4ef6\u548c\u532f\u7e3d\u51fd\u6578SUM\u7d50\u5408\u4f7f\u7528\u5be6\u73fe\u67e5\u8a62"},"content":{"rendered":"<h1 id=\"case-when-end%e6%a2%9d%e4%bb%b6%e5%92%8c%e5%8c%af%e7%b8%bd%e5%87%bd%e6%95%b8sum%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8%e5%af%a6%e7%8f%be%e6%9f%a5%e8%a9%a2-zuNyIdxwak\">CASE WHEN END\u689d\u4ef6\u548c\u532f\u7e3d\u51fd\u6578SUM\u7d50\u5408\u4f7f\u7528\u5be6\u73fe\u67e5\u8a62<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\uff0c<code>CASE WHEN END<\/code>\u8a9e\u53e5\u548c\u532f\u7e3d\u51fd\u6578<code>SUM<\/code>\u7684\u7d50\u5408\u4f7f\u7528\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u9032\u884c\u6578\u64da\u7684\u5f59\u7e3d\u548c\u5206\u6790\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u7d50\u5408\u4f7f\u7528\uff0c\u4e26\u63d0\u4f9b\u5be6\u969b\u7684\u7bc4\u4f8b\u4f86\u8aaa\u660e\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"case-when-end%e8%aa%9e%e5%8f%a5%e6%a6%82%e8%bf%b0-zuNyIdxwak\">CASE WHEN END\u8a9e\u53e5\u6982\u8ff0<\/h2>\n<p><code>CASE WHEN END<\/code>\u8a9e\u53e5\u662f\u4e00\u7a2e\u689d\u4ef6\u8868\u9054\u5f0f\uff0c\u5141\u8a31\u7528\u6236\u5728SQL\u67e5\u8a62\u4e2d\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u8fd4\u56de\u4e0d\u540c\u7684\u503c\u3002\u9019\u7a2e\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nCASE \n    WHEN condition1 THEN result1\n    WHEN condition2 THEN result2\n    ...\n    ELSE resultN\nEND\n<\/code><\/pre>\n<p>\u9019\u7a2e\u8a9e\u53e5\u7684\u9748\u6d3b\u6027\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u66f4\u70ba\u8907\u96dc\u7684\u908f\u8f2f\u5224\u65b7\uff0c\u5f9e\u800c\u7372\u5f97\u66f4\u5177\u91dd\u5c0d\u6027\u7684\u6578\u64da\u7d50\u679c\u3002<\/p>\n<h2 id=\"sum%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-zuNyIdxwak\">SUM\u51fd\u6578\u6982\u8ff0<\/h2>\n<p><code>SUM<\/code>\u51fd\u6578\u662f\u4e00\u500b\u805a\u5408\u51fd\u6578\uff0c\u7528\u65bc\u8a08\u7b97\u6307\u5b9a\u5217\u7684\u7e3d\u548c\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT SUM(column_name) \nFROM table_name\nWHERE condition;\n<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u5728\u6578\u64da\u5206\u6790\u4e2d\u975e\u5e38\u5e38\u898b\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u8a08\u7b97\u67d0\u4e00\u6578\u64da\u96c6\u7684\u7e3d\u548c\u6642\u3002<\/p>\n<h2 id=\"case-when-end%e8%88%87sum%e7%9a%84%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-zuNyIdxwak\">CASE WHEN END\u8207SUM\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n<p>\u5c07<code>CASE WHEN END<\/code>\u8a9e\u53e5\u8207<code>SUM<\/code>\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u548c\u5f59\u7e3d\u3002\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u80cc\u5f8c\u7684\u8da8\u52e2\u548c\u6a21\u5f0f\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-zuNyIdxwak\">\u7bc4\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>sales<\/code>\u7684\u8868\u683c\uff0c\u8a72\u8868\u683c\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li><code>id<\/code> &#8211; \u92b7\u552e\u8a18\u9304\u7684\u552f\u4e00\u6a19\u8b58<\/li>\n<li><code>amount<\/code> &#8211; \u92b7\u552e\u91d1\u984d<\/li>\n<li><code>category<\/code> &#8211; \u92b7\u552e\u985e\u5225\uff08\u4f8b\u5982\uff1a\u96fb\u5b50\u7522\u54c1\u3001\u670d\u88dd\u7b49\uff09<\/li>\n<\/ul>\n<p>\u6211\u5011\u5e0c\u671b\u6839\u64da\u92b7\u552e\u985e\u5225\u8a08\u7b97\u6bcf\u500b\u985e\u5225\u7684\u7e3d\u92b7\u552e\u91d1\u984d\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT \n    category,\n    SUM(CASE \n        WHEN amount &gt; 100 THEN amount \n        ELSE 0 \n    END) AS total_sales\nFROM sales\nGROUP BY category;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>CASE WHEN<\/code>\u8a9e\u53e5\u7528\u65bc\u6aa2\u67e5\u6bcf\u7b46\u92b7\u552e\u91d1\u984d\u662f\u5426\u5927\u65bc100\u3002\u5982\u679c\u662f\uff0c\u5247\u5c07\u8a72\u91d1\u984d\u8a08\u5165\u7e3d\u92b7\u552e\u91d1\u984d\uff1b\u5426\u5247\uff0c\u8a08\u51650\u3002\u6700\u7d42\u7d50\u679c\u5c07\u986f\u793a\u6bcf\u500b\u985e\u5225\u7684\u7e3d\u92b7\u552e\u91d1\u984d\uff0c\u50c5\u8a08\u7b97\u91d1\u984d\u5927\u65bc100\u7684\u92b7\u552e\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-zuNyIdxwak\">\u7d50\u8ad6<\/h2>\n<p>\u901a\u904e\u5c07<code>CASE WHEN END<\/code>\u8a9e\u53e5\u8207<code>SUM<\/code>\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u6578\u64da\u5eab\u7528\u6236\u53ef\u4ee5\u9748\u6d3b\u5730\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u9032\u884c\u6578\u64da\u7684\u5f59\u7e3d\u548c\u5206\u6790\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u63d0\u9ad8\u4e86\u67e5\u8a62\u7684\u9748\u6d3b\u6027\uff0c\u9084\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u80cc\u5f8c\u7684\u610f\u7fa9\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u67e5\u8a62\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u5c0b\u627e<code>VPS<\/code>\u89e3\u6c7a\u65b9\u6848\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff1a<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u3002\u6211\u5011\u63d0\u4f9b\u591a\u7a2e<code>\u4e91\u670d\u52a1\u5668<\/code>\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u5404\u7a2e\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5c07CASE WHEN\u689d\u4ef6\u8207\u532f\u7e3d\u51fd\u6578SUM\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u5be6\u73fe\u9748\u6d3b\u7684\u67e5\u8a62\u548c\u6578\u64da\u5206\u6790\u3002<\/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-59539","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59539","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=59539"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59539\/revisions"}],"predecessor-version":[{"id":59540,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59539\/revisions\/59540"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=59539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=59539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=59539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}