{"id":138431,"date":"2024-10-31T14:25:18","date_gmt":"2024-10-31T06:25:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138431\/"},"modified":"2024-10-31T14:25:18","modified_gmt":"2024-10-31T06:25:18","slug":"sql-server%e6%9f%a5%e8%a9%a2%e5%b9%b3%e5%9d%87%e5%80%bc%e7%9a%84%e5%af%a6%e7%8f%be","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138431\/","title":{"rendered":"sql server\u67e5\u8a62\u5e73\u5747\u503c\u7684\u5be6\u73fe"},"content":{"rendered":"<h1 id=\"sql-server%e6%9f%a5%e8%a9%a2%e5%b9%b3%e5%9d%87%e5%80%bc%e7%9a%84%e5%af%a6%e7%8f%be-cCgMWPeyle\">SQL Server\u67e5\u8a62\u5e73\u5747\u503c\u7684\u5be6\u73fe<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8a08\u7b97\u5e73\u5747\u503c\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u7121\u8ad6\u662f\u5c0d\u55ae\u4e00\u5217\u7684\u6578\u64da\u9032\u884c\u8a08\u7b97\uff0c\u9084\u662f\u5c0d\u591a\u500b\u689d\u4ef6\u4e0b\u7684\u6578\u64da\u9032\u884c\u5206\u7d44\u8a08\u7b97\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728SQL Server\u4e2d\u67e5\u8a62\u5e73\u5747\u503c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8avg%e5%87%bd%e6%95%b8%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e5%80%bc-cCgMWPeyle\">\u4f7f\u7528AVG()\u51fd\u6578\u8a08\u7b97\u5e73\u5747\u503c<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u8a08\u7b97\u5e73\u5747\u503c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<code>AVG()<\/code>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u6578\u5b57\u5217\u7684\u5e73\u5747\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT AVG(column_name) AS AverageValue\nFROM table_name;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c<code>column_name<\/code>\u662f\u4f60\u60f3\u8981\u8a08\u7b97\u5e73\u5747\u503c\u7684\u5217\u540d\uff0c\u800c<code>table_name<\/code>\u5247\u662f\u5305\u542b\u8a72\u5217\u7684\u8868\u540d\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u8a72\u5217\u7684\u5e73\u5747\u503c\uff0c\u4e26\u5c07\u5176\u547d\u540d\u70ba<code>AverageValue<\/code>\u3002<\/p>\n<h2 id=\"%e8%a8%88%e7%ae%97%e5%88%86%e7%b5%84%e5%b9%b3%e5%9d%87%e5%80%bc-cCgMWPeyle\">\u8a08\u7b97\u5206\u7d44\u5e73\u5747\u503c<\/h2>\n<p>\u5982\u679c\u4f60\u9700\u8981\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u4f86\u8a08\u7b97\u5e73\u5747\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528<code>GROUP BY<\/code>\u5b50\u53e5\u3002\u9019\u6a23\u53ef\u4ee5\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\uff0c\u7136\u5f8c\u8a08\u7b97\u6bcf\u7d44\u7684\u5e73\u5747\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT category, AVG(sales) AS AverageSales\nFROM sales_data\nGROUP BY category;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>category<\/code>\u662f\u7528\u4f86\u5206\u7d44\u7684\u5217\uff0c\u800c<code>sales<\/code>\u662f\u6211\u5011\u8981\u8a08\u7b97\u5e73\u5747\u503c\u7684\u5217\u3002\u67e5\u8a62\u7d50\u679c\u5c07\u986f\u793a\u6bcf\u500b\u985e\u5225\u7684\u5e73\u5747\u92b7\u552e\u984d\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-cCgMWPeyle\">\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u6578\u64da<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f60\u53ef\u80fd\u53ea\u60f3\u8a08\u7b97\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u7684\u5e73\u5747\u503c\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u4f86\u904e\u6ffe\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT AVG(score) AS AverageScore\nFROM student_scores\nWHERE subject = 'Math';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8a08\u7b97\u6240\u6709\u6578\u5b78\u79d1\u76ee\u7684\u5e73\u5747\u5206\u6578\u3002<code>WHERE<\/code>\u5b50\u53e5\u78ba\u4fdd\u53ea\u6709\u7b26\u5408\u689d\u4ef6\u7684\u6578\u64da\u88ab\u7528\u4f86\u8a08\u7b97\u5e73\u5747\u503c\u3002<\/p>\n<h2 id=\"%e8%a8%88%e7%ae%97%e5%a4%9a%e5%88%97%e7%9a%84%e5%b9%b3%e5%9d%87%e5%80%bc-cCgMWPeyle\">\u8a08\u7b97\u591a\u5217\u7684\u5e73\u5747\u503c<\/h2>\n<p>\u5982\u679c\u4f60\u9700\u8981\u8a08\u7b97\u591a\u500b\u5217\u7684\u5e73\u5747\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u500b<code>AVG()<\/code>\u51fd\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT AVG(math_score) AS AverageMathScore,\n       AVG(science_score) AS AverageScienceScore\nFROM student_scores;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u540c\u6642\u8fd4\u56de\u6578\u5b78\u548c\u79d1\u5b78\u7684\u5e73\u5747\u5206\u6578\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-cCgMWPeyle\">\u7d50\u8ad6<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u8a08\u7b97\u5e73\u5747\u503c\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u7121\u8ad6\u662f\u4f7f\u7528<code>AVG()<\/code>\u51fd\u6578\uff0c\u9084\u662f\u7d50\u5408<code>GROUP BY<\/code>\u548c<code>WHERE<\/code>\u5b50\u53e5\uff0c\u90fd\u80fd\u9748\u6d3b\u5730\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u5c07\u6709\u52a9\u65bc\u66f4\u6709\u6548\u5730\u5206\u6790\u548c\u8655\u7406\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u904b\u884c\u4f60\u7684SQL Server\uff0c\u9019\u5c07\u70ba\u4f60\u7684\u6578\u64da\u5eab\u7ba1\u7406\u63d0\u4f9b\u7a69\u5b9a\u548c\u9748\u6d3b\u7684\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728SQL Server\u4e2d\u67e5\u8a62\u5e73\u5747\u503c\uff0c\u4f7f\u7528AVG\u51fd\u6578\u8f15\u9b06\u8a08\u7b97\u6578\u64da\u96c6\u7684\u5e73\u5747\u503c\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\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-138431","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138431","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=138431"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138431\/revisions"}],"predecessor-version":[{"id":138432,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138431\/revisions\/138432"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138431"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138431"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}