{"id":141395,"date":"2024-10-31T21:41:22","date_gmt":"2024-10-31T13:41:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141395\/"},"modified":"2024-10-31T21:41:22","modified_gmt":"2024-10-31T13:41:22","slug":"sql-server-%e4%b8%ad%e5%b9%b3%e6%96%b9%e6%a0%b9%e7%9a%84%e8%a8%88%e7%ae%97%e4%b9%8b%e8%b7%af%ef%bc%88sqlserver-%e5%b9%b3%e6%96%b9%e6%a0%b9%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141395\/","title":{"rendered":"SQL Server \u4e2d\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u4e4b\u8def\uff08sqlserver \u5e73\u65b9\u6839\uff09"},"content":{"rendered":"<h1 id=\"sql-server-%e4%b8%ad%e5%b9%b3%e6%96%b9%e6%a0%b9%e7%9a%84%e8%a8%88%e7%ae%97%e4%b9%8b%e8%b7%af%ef%bc%88sqlserver-%e5%b9%b3%e6%96%b9%e6%a0%b9%ef%bc%89-iAreegQcVe\">SQL Server \u4e2d\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u4e4b\u8def\uff08sqlserver \u5e73\u65b9\u6839\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u8655\u7406\u529f\u80fd\u3002\u5176\u4e2d\uff0c\u6578\u5b78\u8a08\u7b97\u662f SQL Server \u7684\u4e00\u500b\u91cd\u8981\u7279\u6027\uff0c\u5c24\u5176\u662f\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL Server \u4e2d\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u65b9\u6cd5\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e5%b9%b3%e6%96%b9%e6%a0%b9%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-iAreegQcVe\">\u5e73\u65b9\u6839\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5e73\u65b9\u6839\u662f\u6307\u4e00\u500b\u6578\u5b57\u7684\u5e73\u65b9\u7b49\u65bc\u53e6\u4e00\u500b\u6578\u5b57\u7684\u904b\u7b97\u3002\u7c21\u55ae\u4f86\u8aaa\uff0c\u82e5 x \u7684\u5e73\u65b9\u7b49\u65bc y\uff0c\u5247 x \u662f y \u7684\u5e73\u65b9\u6839\u3002\u5728\u6578\u5b78\u4e2d\uff0c\u5e73\u65b9\u6839\u901a\u5e38\u7528\u7b26\u865f \u221a \u8868\u793a\u3002\u4f8b\u5982\uff0c\u221a9 = 3\uff0c\u56e0\u70ba 3 \u7684\u5e73\u65b9\u662f 9\u3002<\/p>\n<h2 id=\"sql-server-%e4%b8%ad%e7%9a%84%e5%b9%b3%e6%96%b9%e6%a0%b9%e8%a8%88%e7%ae%97-iAreegQcVe\">SQL Server \u4e2d\u7684\u5e73\u65b9\u6839\u8a08\u7b97<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u8a08\u7b97\u5e73\u65b9\u6839\u7684\u4e3b\u8981\u51fd\u6578\u662f <code>SQRT()<\/code>\u3002\u9019\u500b\u51fd\u6578\u63a5\u53d7\u4e00\u500b\u6578\u5b57\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u8a72\u6578\u5b57\u7684\u5e73\u65b9\u6839\u3002\u4ee5\u4e0b\u662f <code>SQRT()<\/code> \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SQRT ( numeric_expression )<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>numeric_expression<\/code> \u662f\u8981\u8a08\u7b97\u5e73\u65b9\u6839\u7684\u6578\u5b57\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8a72\u6578\u5b57\u5fc5\u9808\u662f\u975e\u8ca0\u7684\uff0c\u5426\u5247 SQL Server \u5c07\u8fd4\u56de\u932f\u8aa4\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-iAreegQcVe\">\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728 SQL Server \u4e2d\u4f7f\u7528 <code>SQRT()<\/code> \u51fd\u6578\uff1a<\/p>\n<pre><code>SELECT SQRT(16) AS SquareRoot;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u7d50\u679c\u5c07\u986f\u793a\uff1a<\/p>\n<pre><code>SquareRoot\n------------\n4<\/code><\/pre>\n<p>\u9019\u8868\u660e 16 \u7684\u5e73\u65b9\u6839\u662f 4\u3002<\/p>\n<h2 id=\"%e5%b9%b3%e6%96%b9%e6%a0%b9%e8%a8%88%e7%ae%97%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-iAreegQcVe\">\u5e73\u65b9\u6839\u8a08\u7b97\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u5206\u6790\u548c\u7d71\u8a08\u5b78\u4e2d\u3002\u4f8b\u5982\uff0c\u5728\u8a08\u7b97\u6a19\u6e96\u5dee\u6642\uff0c\u5e73\u65b9\u6839\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6b65\u9a5f\u3002\u6a19\u6e96\u5dee\u7528\u65bc\u8861\u91cf\u6578\u64da\u96c6\u7684\u5206\u6563\u7a0b\u5ea6\uff0c\u8a08\u7b97\u516c\u5f0f\u4e2d\u5305\u542b\u5e73\u65b9\u6839\u7684\u904b\u7b97\u3002<\/p>\n<h3 id=\"%e6%a8%99%e6%ba%96%e5%b7%ae%e8%a8%88%e7%ae%97%e7%af%84%e4%be%8b-iAreegQcVe\">\u6a19\u6e96\u5dee\u8a08\u7b97\u7bc4\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u8a08\u7b97\u6a19\u6e96\u5dee\u7684 SQL \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH Data AS (\n    SELECT Value\n    FROM (VALUES (10), (20), (30), (40), (50)) AS T(Value)\n),\nMean AS (\n    SELECT AVG(Value) AS AvgValue\n    FROM Data\n)\nSELECT SQRT(SUM(POWER(Value - (SELECT AvgValue FROM Mean), 2)) \/ COUNT(*)) AS StandardDeviation\nFROM Data;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u8a08\u7b97\u6578\u64da\u96c6\u7684\u5e73\u5747\u503c\uff0c\u7136\u5f8c\u4f7f\u7528\u5e73\u65b9\u6839\u4f86\u8a08\u7b97\u6a19\u6e96\u5dee\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-iAreegQcVe\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 <code>SQRT()<\/code> \u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u8f38\u5165\u503c\u5fc5\u9808\u662f\u975e\u8ca0\u6578\uff0c\u5426\u5247\u6703\u8fd4\u56de\u932f\u8aa4\u3002<\/li>\n<li>\u5c0d\u65bc\u5927\u6578\u64da\u96c6\u7684\u8a08\u7b97\uff0c\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u6b64\u5728\u8a2d\u8a08\u67e5\u8a62\u6642\u61c9\u8003\u616e\u6548\u7387\u3002<\/li>\n<li>\u5728\u9032\u884c\u6578\u5b78\u904b\u7b97\u6642\uff0c\u61c9\u78ba\u4fdd\u6578\u64da\u985e\u578b\u7684\u6b63\u78ba\u6027\uff0c\u4ee5\u907f\u514d\u985e\u578b\u8f49\u63db\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-iAreegQcVe\">\u7e3d\u7d50<\/h2>\n<p>SQL Server \u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u5b78\u8a08\u7b97\u529f\u80fd\uff0c\u5176\u4e2d\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u662f\u6578\u64da\u5206\u6790\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u901a\u904e\u4f7f\u7528 <code>SQRT()<\/code> \u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u5e73\u65b9\u6839\u8a08\u7b97\uff0c\u4e26\u5728\u7d71\u8a08\u5206\u6790\u4e2d\u61c9\u7528\u9019\u4e00\u7d50\u679c\u3002\u7121\u8ad6\u662f\u5728\u8a08\u7b97\u6a19\u6e96\u5dee\u9084\u662f\u5176\u4ed6\u6578\u5b78\u904b\u7b97\u4e2d\uff0c\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u6578\u64da\u6d1e\u5bdf\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u6709\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL Server \u4e2d\u5e73\u65b9\u6839\u7684\u8a08\u7b97\u65b9\u6cd5\uff0c\u4e86\u89e3\u5982\u4f55\u4f7f\u7528\u5167\u5efa\u51fd\u6578\u8f15\u9b06\u7372\u53d6\u6578\u503c\u7684\u5e73\u65b9\u6839\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-141395","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141395","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=141395"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141395\/revisions"}],"predecessor-version":[{"id":141396,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141395\/revisions\/141396"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}