{"id":138977,"date":"2024-10-31T17:11:18","date_gmt":"2024-10-31T09:11:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138977\/"},"modified":"2024-10-31T17:11:19","modified_gmt":"2024-10-31T09:11:19","slug":"sql-server%e6%b1%82%e8%a7%a3%e5%b9%b3%e5%9d%87%e6%95%b8%e8%a8%88%e7%ae%97%e5%8f%8a%e6%87%89%e7%94%a8%ef%bc%88sqlserver%e5%b9%b3%e5%9d%87%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138977\/","title":{"rendered":"SQL Server\u6c42\u89e3\u5e73\u5747\u6578\u8a08\u7b97\u53ca\u61c9\u7528\uff08sqlserver\u5e73\u5747\u6578\uff09"},"content":{"rendered":"<h1 id=\"sql-server%e6%b1%82%e8%a7%a3%e5%b9%b3%e5%9d%87%e6%95%b8%e8%a8%88%e7%ae%97%e5%8f%8a%e6%87%89%e7%94%a8%ef%bc%88sqlserver%e5%b9%b3%e5%9d%87%e6%95%b8%ef%bc%89-tcHhPAWGmL\">SQL Server\u6c42\u89e3\u5e73\u5747\u6578\u8a08\u7b97\u53ca\u61c9\u7528\uff08sqlserver\u5e73\u5747\u6578\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5206\u6790\u548c\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5e73\u5747\u6578\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u7d71\u8a08\u6307\u6a19\u3002\u5b83\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u7406\u89e3\u6578\u64da\u7684\u6574\u9ad4\u8da8\u52e2\u548c\u7279\u5fb5\u3002\u5728SQL Server\u4e2d\uff0c\u8a08\u7b97\u5e73\u5747\u6578\u7684\u529f\u80fd\u975e\u5e38\u5f37\u5927\uff0c\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728SQL Server\u4e2d\u8a08\u7b97\u5e73\u5747\u6578\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%b9%b3%e5%9d%87%e6%95%b8%ef%bc%9f-tcHhPAWGmL\">\u4ec0\u9ebc\u662f\u5e73\u5747\u6578\uff1f<\/h2>\n<p>\u5e73\u5747\u6578\u662f\u6307\u4e00\u7d44\u6578\u64da\u7684\u7e3d\u548c\u9664\u4ee5\u6578\u64da\u7684\u500b\u6578\u3002\u5b83\u662f\u63cf\u8ff0\u6578\u64da\u96c6\u4e2d\u8da8\u52e2\u7684\u4e00\u7a2e\u5e38\u7528\u65b9\u6cd5\u3002\u5e73\u5747\u6578\u53ef\u4ee5\u5206\u70ba\u7b97\u8853\u5e73\u5747\u6578\u3001\u5e7e\u4f55\u5e73\u5747\u6578\u548c\u8abf\u548c\u5e73\u5747\u6578\u7b49\uff0c\u5176\u4e2d\u7b97\u8853\u5e73\u5747\u6578\u662f\u6700\u5e38\u7528\u7684\u5f62\u5f0f\u3002<\/p>\n<h2 id=\"%e5%9c%a8sql-server%e4%b8%ad%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e6%95%b8-tcHhPAWGmL\">\u5728SQL Server\u4e2d\u8a08\u7b97\u5e73\u5747\u6578<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u5167\u5efa\u7684\u805a\u5408\u51fd\u6578 <code>AVG()<\/code> \u4f86\u8a08\u7b97\u5e73\u5747\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u6578\u5b57\u985e\u578b\u7684\u5217\uff0c\u4e26\u8fd4\u56de\u8a72\u5217\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h3 id=\"%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-tcHhPAWGmL\">\u57fa\u672c\u8a9e\u6cd5<\/h3>\n<pre><code>SELECT AVG(column_name) AS average_value\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<h3 id=\"%e7%a4%ba%e4%be%8b-tcHhPAWGmL\">\u793a\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\u4e86\u6bcf\u500b\u92b7\u552e\u54e1\u7684\u92b7\u552e\u984d\u3002\u6211\u5011\u5e0c\u671b\u8a08\u7b97\u6240\u6709\u92b7\u552e\u54e1\u7684\u5e73\u5747\u92b7\u552e\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT AVG(SalesAmount) AS AverageSales\nFROM Sales;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>SalesAmount<\/code> \u5217\u7684\u5e73\u5747\u503c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8avg%e5%87%bd%e6%95%b8%e7%9a%84%e9%80%b2%e9%9a%8e%e6%87%89%e7%94%a8-tcHhPAWGmL\">\u4f7f\u7528AVG()\u51fd\u6578\u7684\u9032\u968e\u61c9\u7528<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u5e73\u5747\u6578\u8a08\u7b97\uff0c<code>AVG()<\/code> \u51fd\u6578\u9084\u53ef\u4ee5\u8207\u5176\u4ed6SQL\u529f\u80fd\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u6eff\u8db3\u66f4\u8907\u96dc\u7684\u9700\u6c42\u3002<\/p>\n<h3 id=\"%e5%88%86%e7%b5%84%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e6%95%b8-tcHhPAWGmL\">\u5206\u7d44\u8a08\u7b97\u5e73\u5747\u6578<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\u4f86\u8a08\u7b97\u6bcf\u500b\u5206\u7d44\u7684\u5e73\u5747\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u8a08\u7b97\u6bcf\u500b\u92b7\u552e\u54e1\u7684\u5e73\u5747\u92b7\u552e\u984d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT SalesPerson, AVG(SalesAmount) AS AverageSales\nFROM Sales\nGROUP BY SalesPerson;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u4f4d\u92b7\u552e\u54e1\u7684\u5e73\u5747\u92b7\u552e\u984d\u3002<\/p>\n<h3 id=\"%e9%81%8e%e6%bf%be%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e6%95%b8-tcHhPAWGmL\">\u904e\u6ffe\u8a08\u7b97\u5e73\u5747\u6578<\/h3>\n<p>\u6709\u6642\u5019\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u60f3\u8a08\u7b97\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u7684\u5e73\u5747\u6578\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u4f86\u904e\u6ffe\u6578\u64da\u3002\u4f8b\u5982\uff0c\u8a08\u7b97\u92b7\u552e\u984d\u5927\u65bc1000\u7684\u92b7\u552e\u54e1\u7684\u5e73\u5747\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>SELECT AVG(SalesAmount) AS AverageSales\nFROM Sales\nWHERE SalesAmount &gt; 1000;<\/code><\/pre>\n<h2 id=\"%e5%b9%b3%e5%9d%87%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-tcHhPAWGmL\">\u5e73\u5747\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u5e73\u5747\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u6709\u5ee3\u6cdb\u7684\u61c9\u7528\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u65bc\uff1a<\/p>\n<ul>\n<li><strong>\u696d\u52d9\u5206\u6790\uff1a<\/strong>\u4f01\u696d\u53ef\u4ee5\u901a\u904e\u8a08\u7b97\u5e73\u5747\u92b7\u552e\u984d\u4f86\u8a55\u4f30\u696d\u52d9\u8868\u73fe\u3002<\/li>\n<li><strong>\u5e02\u5834\u7814\u7a76\uff1a<\/strong>\u901a\u904e\u5206\u6790\u6d88\u8cbb\u8005\u7684\u5e73\u5747\u652f\u51fa\uff0c\u4f01\u696d\u53ef\u4ee5\u5236\u5b9a\u66f4\u6709\u6548\u7684\u5e02\u5834\u7b56\u7565\u3002<\/li>\n<li><strong>\u5b78\u8853\u7814\u7a76\uff1a<\/strong>\u5728\u5b78\u8853\u7814\u7a76\u4e2d\uff0c\u5e73\u5747\u6578\u5e38\u7528\u65bc\u6578\u64da\u5206\u6790\u548c\u7d50\u679c\u5c55\u793a\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tcHhPAWGmL\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u8a08\u7b97\u5e73\u5747\u6578\u662f\u4e00\u500b\u7c21\u55ae\u800c\u5f37\u5927\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6578\u64da\u7684\u6574\u9ad4\u8da8\u52e2\u3002\u901a\u904e\u4f7f\u7528 <code>AVG()<\/code> \u51fd\u6578\uff0c\u4e26\u7d50\u5408 <code>GROUP BY<\/code> \u548c <code>WHERE<\/code> \u5b50\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u9748\u6d3b\u5730\u8a08\u7b97\u5404\u7a2e\u60c5\u6cc1\u4e0b\u7684\u5e73\u5747\u6578\u3002\u7121\u8ad6\u662f\u5728\u696d\u52d9\u5206\u6790\u3001\u5b78\u8853\u7814\u7a76\u9084\u662f\u5e02\u5834\u7814\u7a76\u4e2d\uff0c\u5e73\u5747\u6578\u90fd\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u5206\u6790\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u74b0\u5883\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2d\u5e73\u5747\u6578\u8a08\u7b97\u7684\u6280\u5de7\u8207\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\uff0c\u8f15\u9b06\u638c\u63e1sqlserver\u5e73\u5747\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\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-138977","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138977","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=138977"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138977\/revisions"}],"predecessor-version":[{"id":138978,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138977\/revisions\/138978"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138977"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138977"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138977"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}