{"id":146007,"date":"2024-11-01T11:09:30","date_gmt":"2024-11-01T03:09:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/146007\/"},"modified":"2024-11-01T11:09:31","modified_gmt":"2024-11-01T03:09:31","slug":"vsmssql-%e4%b8%ad-avg-%e5%87%bd%e6%95%b8%e8%88%87%e5%85%b6%e4%bb%96%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e6%93%8d%e4%bd%9c%e7%9a%84%e6%af%94%e8%bc%83%ef%bc%88mssql-avg%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/146007\/","title":{"rendered":"VSMSSQL \u4e2d AVG \u51fd\u6578\u8207\u5176\u4ed6\u6578\u64da\u8655\u7406\u64cd\u4f5c\u7684\u6bd4\u8f03\uff08mssql avg\uff09"},"content":{"rendered":"<h1 id=\"vsmssql-%e4%b8%ad-avg-%e5%87%bd%e6%95%b8%e8%88%87%e5%85%b6%e4%bb%96%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e6%93%8d%e4%bd%9c%e7%9a%84%e6%af%94%e8%bc%83%ef%bc%88mssql-avg%ef%bc%89-wZlwzKsKNd\">VSMSSQL \u4e2d AVG \u51fd\u6578\u8207\u5176\u4ed6\u6578\u64da\u8655\u7406\u64cd\u4f5c\u7684\u6bd4\u8f03\uff08mssql avg\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u7684\u8655\u7406\u548c\u5206\u6790\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Microsoft SQL Server\uff08MSSQL\uff09\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u5206\u6790\uff0c\u5176\u4e2d <code>AVG<\/code> \u51fd\u6578\u662f\u6700\u5e38\u7528\u7684\u805a\u5408\u51fd\u6578\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u63a2\u8a0e <code>AVG<\/code> \u51fd\u6578\u7684\u4f7f\u7528\uff0c\u4e26\u8207\u5176\u4ed6\u6578\u64da\u8655\u7406\u64cd\u4f5c\u9032\u884c\u6bd4\u8f03\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u61c9\u7528\u5834\u666f\u548c\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"avg-%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-wZlwzKsKNd\">AVG \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p><code>AVG<\/code> \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u6307\u5b9a\u5217\u7684\u5e73\u5747\u503c\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT AVG(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba <code>Sales<\/code> \u7684\u8868\uff0c\u5305\u542b <code>Amount<\/code> \u5217\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u8a08\u7b97\u92b7\u552e\u91d1\u984d\u7684\u5e73\u5747\u503c\uff1a<\/p>\n<pre><code>SELECT AVG(Amount) AS AverageSales FROM Sales;<\/code><\/pre>\n<h2 id=\"avg-%e5%87%bd%e6%95%b8%e7%9a%84%e7%89%b9%e9%bb%9e-wZlwzKsKNd\">AVG \u51fd\u6578\u7684\u7279\u9ede<\/h2>\n<ul>\n<li><strong>\u7c21\u55ae\u6613\u7528\uff1a<\/strong> <code>AVG<\/code> \u51fd\u6578\u7684\u8a9e\u6cd5\u7c21\u55ae\uff0c\u6613\u65bc\u7406\u89e3\uff0c\u9069\u5408\u521d\u5b78\u8005\u4f7f\u7528\u3002<\/li>\n<li><strong>\u81ea\u52d5\u5ffd\u7565 NULL \u503c\uff1a<\/strong> \u5728\u8a08\u7b97\u5e73\u5747\u503c\u6642\uff0c<code>AVG<\/code> \u51fd\u6578\u6703\u81ea\u52d5\u5ffd\u7565 NULL \u503c\uff0c\u9019\u4f7f\u5f97\u8a08\u7b97\u7d50\u679c\u66f4\u52a0\u6e96\u78ba\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong> \u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c<code>AVG<\/code> \u51fd\u6578\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u6c92\u6709\u9069\u7576\u7d22\u5f15\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%88%87%e5%85%b6%e4%bb%96%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%9a%84%e6%af%94%e8%bc%83-wZlwzKsKNd\">\u8207\u5176\u4ed6\u805a\u5408\u51fd\u6578\u7684\u6bd4\u8f03<\/h2>\n<p>\u9664\u4e86 <code>AVG<\/code> \u51fd\u6578\uff0cMSSQL \u9084\u63d0\u4f9b\u4e86\u5176\u4ed6\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>SUM<\/code>\u3001<code>COUNT<\/code>\u3001<code>MIN<\/code> \u548c <code>MAX<\/code>\u3002\u9019\u4e9b\u51fd\u6578\u5404\u6709\u5176\u7279\u9ede\u548c\u9069\u7528\u5834\u666f\uff1a<\/p>\n<h3 id=\"1-sum-%e5%87%bd%e6%95%b8-wZlwzKsKNd\">1. SUM \u51fd\u6578<\/h3>\n<p><code>SUM<\/code> \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u6307\u5b9a\u5217\u7684\u7e3d\u548c\u3002\u8207 <code>AVG<\/code> \u51fd\u6578\u4e0d\u540c\uff0c<code>SUM<\/code> \u51fd\u6578\u4e0d\u6703\u8a08\u7b97\u5e73\u5747\u503c\uff0c\u800c\u662f\u76f4\u63a5\u8fd4\u56de\u6240\u6709\u503c\u7684\u7e3d\u548c\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT SUM(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u8a08\u7b97\u92b7\u552e\u91d1\u984d\u7684\u7e3d\u548c\uff1a<\/p>\n<pre><code>SELECT SUM(Amount) AS TotalSales FROM Sales;<\/code><\/pre>\n<h3 id=\"2-count-%e5%87%bd%e6%95%b8-wZlwzKsKNd\">2. COUNT \u51fd\u6578<\/h3>\n<p><code>COUNT<\/code> \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u884c\u6578\u6216\u7279\u5b9a\u5217\u7684\u975e NULL \u503c\u6578\u91cf\u3002\u9019\u5728\u9700\u8981\u4e86\u89e3\u6578\u64da\u96c6\u5927\u5c0f\u6642\u975e\u5e38\u6709\u7528\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT COUNT(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<h3 id=\"3-min-%e5%92%8c-max-%e5%87%bd%e6%95%b8-wZlwzKsKNd\">3. MIN \u548c MAX \u51fd\u6578<\/h3>\n<p><code>MIN<\/code> \u548c <code>MAX<\/code> \u51fd\u6578\u5206\u5225\u7528\u65bc\u67e5\u627e\u6307\u5b9a\u5217\u7684\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c\u3002\u9019\u4e9b\u51fd\u6578\u5728\u9700\u8981\u4e86\u89e3\u6578\u64da\u7bc4\u570d\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre><code>SELECT MIN(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<pre><code>SELECT MAX(column_name) FROM table_name WHERE condition;<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8-avg-%e5%87%bd%e6%95%b8%e7%9a%84%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b-wZlwzKsKNd\">\u4f7f\u7528 AVG \u51fd\u6578\u7684\u5be6\u969b\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b <code>Students<\/code> \u8868\uff0c\u5305\u542b\u5b78\u751f\u7684\u6210\u7e3e\uff0c\u60a8\u5e0c\u671b\u8a08\u7b97\u6240\u6709\u5b78\u751f\u7684\u5e73\u5747\u6210\u7e3e\uff1a<\/p>\n<pre><code>SELECT AVG(Score) AS AverageScore FROM Students;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5b78\u751f\u7684\u5e73\u5747\u6210\u7e3e\uff0c\u5e6b\u52a9\u5b78\u6821\u4e86\u89e3\u6574\u9ad4\u5b78\u7fd2\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wZlwzKsKNd\">\u7d50\u8ad6<\/h2>\n<p>\u5728 MSSQL \u4e2d\uff0c<code>AVG<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u8a08\u7b97\u6578\u64da\u7684\u5e73\u5747\u503c\u3002\u8207\u5176\u4ed6\u805a\u5408\u51fd\u6578\u76f8\u6bd4\uff0c<code>AVG<\/code> \u51fd\u6578\u5728\u6578\u64da\u5206\u6790\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u4e86\u89e3\u9019\u4e9b\u51fd\u6578\u7684\u7279\u9ede\u548c\u4f7f\u7528\u5834\u666f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u4f01\u696d\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6bd4\u8f03 VSMSSQL \u4e2d AVG \u51fd\u6578\u8207\u5176\u4ed6\u6578\u64da\u8655\u7406\u64cd\u4f5c\uff0c\u6df1\u5165\u4e86\u89e3\u5176\u6027\u80fd\u3001\u7528\u6cd5\u53ca\u5728\u6578\u64da\u5206\u6790\u4e2d\u7684\u61c9\u7528\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-146007","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/146007","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=146007"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/146007\/revisions"}],"predecessor-version":[{"id":146015,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/146007\/revisions\/146015"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=146007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=146007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=146007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}