{"id":201045,"date":"2025-05-06T09:36:22","date_gmt":"2025-05-06T01:36:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201045\/"},"modified":"2025-05-06T09:36:22","modified_gmt":"2025-05-06T01:36:22","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%8a%a8%e6%80%81-sql-%e8%af%ad%e5%8f%a5%e7%bb%9f%e8%ae%a1%e4%b8%8d%e5%90%8c%e5%9c%b0%e5%b8%82%e7%9a%84%e7%bb%93%e6%9e%9c%e7%8a%b6%e6%80%81%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201045\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528\u52a8\u6001 SQL \u8bed\u53e5\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528\u52a8\u6001 SQL \u8bed\u53e5\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f<\/h1>\n<p>\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241127\/17326978576746df016745b.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>sql \u67e5\u8be2\u5730\u5e02\u72b6\u6001\u7edf\u8ba1<\/strong><\/p>\n<p>\u4e3a\u4e86\u6ee1\u8db3\u5728\u4e0d\u5199\u6b7b\u57ce\u5e02\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff0c\u53ef\u4ee5\u91c7\u7528\u52a8\u6001 sql \u8bed\u53e5\u3002 <\/p>\n<p>sql \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n<pre>select\n    result_status,\n&lt;foreach collection=\"citys\" item=\"city\"&gt;\n    count(case when city = #{city.id} then city end ) as city.name,\n&lt;\/foreach&gt;\nfrom\n    sys_patrol \nwhere\n    year ( start_patrol_time ) = '2021' \ngroup by\n    result_status<\/pre>\n<p>\u5728\u8be5\u8bed\u53e5\u4e2d\uff0c\u4f7f\u7528\u4e86 <strong>foreach<\/strong> \u5faa\u73af\u6765\u52a8\u6001\u751f\u6210\u7edf\u8ba1\u57ce\u5e02\u90e8\u5206\u7684\u4ee3\u7801\u3002 <strong>foreach<\/strong> \u5faa\u73af\u904d\u5386\u57ce\u5e02\u5217\u8868 <strong>citys<\/strong>\uff0c\u5e76\u5c06\u6bcf\u4e2a\u57ce\u5e02\u5bf9\u8c61 <strong>city<\/strong> \u4f5c\u4e3a\u5f53\u524d\u5faa\u73af\u7684\u53d8\u91cf\u3002\u4f9d\u6b21\u6839\u636e\u57ce\u5e02\u5bf9\u8c61\u7684 <strong>id<\/strong> \u5c5e\u6027\u751f\u6210\u7edf\u8ba1\u6761\u4ef6\u3002 <\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe<strong>citys<\/strong> \u5217\u8868\u5305\u542b\u5317\u4eac\u3001\u5929\u6d25\u548c\u6cb3\u5317\u4e09\u4e2a\u57ce\u5e02\uff1a<\/p>\n<ul>\n<li>\u5317\u4eac\u7684id \u4e3a&#8217;110000000000&#8242;<\/li>\n<li>\u5929\u6d25\u7684id \u4e3a&#8217;120000000000&#8242;<\/li>\n<li>\u6cb3\u5317\u7684id \u4e3a&#8217;130000000000&#8242;<\/li>\n<\/ul>\n<p>\u90a3\u4e48\uff0c\u751f\u6210\u7684sql \u8bed\u53e5\u5c06\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>SELECT\n    result_status,\n    COUNT(CASE WHEN city = '110000000000' THEN city END ) AS '\u5317\u4eac',\n    COUNT(CASE WHEN city = '120000000000' THEN city END ) AS '\u5929\u6d25',\n    COUNT(CASE WHEN city = '130000000000' THEN city END ) AS '\u6cb3\u5317' \nFROM\n    sys_patrol \nWHERE\n    YEAR ( start_patrol_time ) = '2021' \nGROUP BY\n    result_status<\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u907f\u514d\u5199\u6b7b\u57ce\u5e02\u4ee3\u7801\uff0c\u53ea\u9700\u52a8\u6001\u4f20\u5165<strong>citys<\/strong> \u5217\u8868\u5373\u53ef\u5b8c\u6210\u4e0d\u540c\u5730\u5e02\u306e\u7ed3\u679c\u72b6\u6001\u7edf\u8ba1\u3002 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300a\u5982\u4f55\u4f7f\u7528\u52a8\u6001 SQL \u8bed\u53e5\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528\u52a8\u6001 SQL \u8bed\u53e5\u7edf\u8ba1\u4e0d&#46;&#46;&#46;<\/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-201045","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201045","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=201045"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201045\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}