{"id":137397,"date":"2024-10-31T12:20:23","date_gmt":"2024-10-31T04:20:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/137397\/"},"modified":"2024-10-31T12:20:24","modified_gmt":"2024-10-31T04:20:24","slug":"sql-server-group-by%e7%9a%84%e7%94%a8%e6%b3%95%e6%9c%89%e5%be%88%e5%a4%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/137397\/","title":{"rendered":"SQL Server group by\u7684\u7528\u6cd5\u6709\u5f88\u591a"},"content":{"rendered":"<h1 id=\"sql-server-group-by-%e7%9a%84%e7%94%a8%e6%b3%95%e6%9c%89%e5%be%88%e5%a4%9a-wpEbimDIzK\">SQL Server GROUP BY \u7684\u7528\u6cd5\u6709\u5f88\u591a<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5176\u5f37\u5927\u7684\u67e5\u8a62\u529f\u80fd\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u6709\u6548\u5730\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\u3002\u5176\u4e2d\uff0c<code>GROUP BY<\/code> \u5b50\u53e5\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u5206\u7d44\uff0c\u4e26\u9032\u884c\u805a\u5408\u8a08\u7b97\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL Server \u4e2d <code>GROUP BY<\/code> \u7684\u591a\u7a2e\u7528\u6cd5\u53ca\u5176\u5be6\u969b\u61c9\u7528\u3002<\/p>\n<h2 id=\"group-by-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-wpEbimDIzK\">GROUP BY \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p><code>GROUP BY<\/code> \u5b50\u53e5\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u67e5\u8a62\u7d50\u679c\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5217\u9032\u884c\u5206\u7d44\u3002\u9019\u6a23\uff0c\u7528\u6236\u53ef\u4ee5\u5c0d\u6bcf\u500b\u5206\u7d44\u9032\u884c\u805a\u5408\u8a08\u7b97\uff0c\u4f8b\u5982\u8a08\u7b97\u7e3d\u548c\u3001\u5e73\u5747\u503c\u3001\u8a08\u6578\u7b49\u3002\u4f7f\u7528 <code>GROUP BY<\/code> \u6642\uff0c\u901a\u5e38\u6703\u642d\u914d\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>SUM()<\/code>\u3001<code>AVG()<\/code>\u3001<code>COUNT()<\/code> \u7b49\u3002<\/p>\n<h2 id=\"group-by-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-wpEbimDIzK\">GROUP BY \u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>\nSELECT column1, aggregate_function(column2)\nFROM table_name\nWHERE condition\nGROUP BY column1;\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u8a9e\u6cd5\u4e2d\uff0c<code>column1<\/code> \u662f\u7528\u4f86\u5206\u7d44\u7684\u5217\uff0c\u800c <code>aggregate_function(column2)<\/code> \u5247\u662f\u5c0d <code>column2<\/code> \u9032\u884c\u7684\u805a\u5408\u8a08\u7b97\u3002<\/p>\n<h2 id=\"group-by-%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e7%af%84%e4%be%8b-wpEbimDIzK\">GROUP BY \u7684\u5be6\u969b\u61c9\u7528\u7bc4\u4f8b<\/h2>\n<h3 id=\"%e7%af%84%e4%be%8b-1%ef%bc%9a%e8%a8%88%e7%ae%97%e6%af%8f%e5%80%8b%e9%83%a8%e9%96%80%e7%9a%84%e5%93%a1%e5%b7%a5%e6%95%b8%e9%87%8f-wpEbimDIzK\">\u7bc4\u4f8b 1\uff1a\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Employees<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u54e1\u5de5\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u5305\u62ec <code>Department<\/code> \u548c <code>EmployeeID<\/code>\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u4f86\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\uff1a<\/p>\n<pre><code>\nSELECT Department, COUNT(EmployeeID) AS EmployeeCount\nFROM Employees\nGROUP BY Department;\n<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u53ca\u5176\u5c0d\u61c9\u7684\u54e1\u5de5\u6578\u91cf\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2%ef%bc%9a%e8%a8%88%e7%ae%97%e6%af%8f%e5%80%8b%e7%94%a2%e5%93%81%e9%a1%9e%e5%88%a5%e7%9a%84%e7%b8%bd%e9%8a%b7%e5%94%ae%e9%a1%8d-wpEbimDIzK\">\u7bc4\u4f8b 2\uff1a\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u985e\u5225\u7684\u7e3d\u92b7\u552e\u984d<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Sales<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u7522\u54c1\u7684\u92b7\u552e\u6578\u64da\uff0c\u5305\u62ec <code>Category<\/code> \u548c <code>Amount<\/code>\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u4f86\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u985e\u5225\u7684\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>\nSELECT Category, SUM(Amount) AS TotalSales\nFROM Sales\nGROUP BY Category;\n<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u985e\u5225\u53ca\u5176\u5c0d\u61c9\u7684\u7e3d\u92b7\u552e\u984d\u3002<\/p>\n<h2 id=\"group-by-%e7%9a%84%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-wpEbimDIzK\">GROUP BY \u7684\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u5206\u7d44\u529f\u80fd\u5916\uff0c<code>GROUP BY<\/code> \u9084\u53ef\u4ee5\u8207\u5176\u4ed6 SQL \u529f\u80fd\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u5be6\u73fe\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>HAVING<\/code> \u5b50\u53e5\u4f86\u904e\u6ffe\u5206\u7d44\u7d50\u679c\uff1a<\/p>\n<pre><code>\nSELECT Department, COUNT(EmployeeID) AS EmployeeCount\nFROM Employees\nGROUP BY Department\nHAVING COUNT(EmployeeID) &gt; 10;\n<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u54e1\u5de5\u6578\u91cf\u5927\u65bc 10 \u7684\u90e8\u9580\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wpEbimDIzK\">\u7d50\u8ad6<\/h2>\n<p>SQL Server \u7684 <code>GROUP BY<\/code> \u5b50\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u6709\u6548\u7684\u5206\u7d44\u548c\u805a\u5408\u8a08\u7b97\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0c<code>GROUP BY<\/code> \u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u900f\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u5e0c\u671b\u8b80\u8005\u80fd\u5920\u66f4\u597d\u5730\u7406\u89e3\u548c\u904b\u7528 <code>GROUP BY<\/code> \u7684\u5404\u7a2e\u7528\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2dGROUP BY\u7684\u591a\u79cd\u7528\u6cd5\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u805a\u5408\uff0c\u63d0\u5347\u6570\u636e\u5206\u6790\u80fd\u529b\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-137397","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137397","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=137397"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137397\/revisions"}],"predecessor-version":[{"id":137398,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137397\/revisions\/137398"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=137397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=137397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=137397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}