{"id":153247,"date":"2024-11-02T05:51:24","date_gmt":"2024-11-01T21:51:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153247\/"},"modified":"2024-11-02T05:51:25","modified_gmt":"2024-11-01T21:51:25","slug":"%e5%be%9e-sql-server-%e4%b8%ad%e6%9f%a5%e9%87%8d%ef%bc%9a%e8%a6%81%e9%bb%9e%e5%9c%a8%e6%96%bc%e6%ad%a3%e7%a2%ba%e7%9a%84%e6%af%94%e5%b0%8d%ef%bc%88sql-server-%e6%9f%a5%e9%87%8d%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153247\/","title":{"rendered":"\u5f9e SQL SERVER \u4e2d\u67e5\u91cd\uff1a\u8981\u9ede\u5728\u65bc\u6b63\u78ba\u7684\u6bd4\u5c0d\uff08SQL Server \u67e5\u91cd\uff09"},"content":{"rendered":"<h1 id=\"%e5%be%9e-sql-server-%e4%b8%ad%e6%9f%a5%e9%87%8d%ef%bc%9a%e8%a6%81%e9%bb%9e%e5%9c%a8%e6%96%bc%e6%ad%a3%e7%a2%ba%e7%9a%84%e6%af%94%e5%b0%8d%ef%bc%88sql-server-%e6%9f%a5%e9%87%8d%ef%bc%89-wzsEaLlXdU\">\u5f9e SQL SERVER \u4e2d\u67e5\u91cd\uff1a\u8981\u9ede\u5728\u65bc\u6b63\u78ba\u7684\u6bd4\u5c0d\uff08SQL Server \u67e5\u91cd\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u67e5\u8a62\u6548\u7387\uff0c\u751a\u81f3\u5f71\u97ff\u696d\u52d9\u6c7a\u7b56\u3002\u56e0\u6b64\uff0c\u5c0d\u65bc\u4f7f\u7528 SQL Server \u7684\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u67e5\u91cd\u662f\u4e00\u9805\u91cd\u8981\u7684\u4efb\u52d9\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 SQL Server \u4e2d\u6709\u6548\u5730\u67e5\u627e\u91cd\u8907\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%9f%a5%e9%87%8d%ef%bc%9f-wzsEaLlXdU\">\u70ba\u4ec0\u9ebc\u9700\u8981\u67e5\u91cd\uff1f<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u591a\u7a2e\u554f\u984c\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff1a\u76f8\u540c\u7684\u6578\u64da\u53ef\u80fd\u5728\u4e0d\u540c\u7684\u8a18\u9304\u4e2d\u5b58\u5728\u4e0d\u540c\u7684\u503c\u3002<\/li>\n<li>\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\uff1a\u91cd\u8907\u7684\u6578\u64da\u6703\u589e\u52a0\u67e5\u8a62\u7684\u8ca0\u64d4\uff0c\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li>\u696d\u52d9\u6c7a\u7b56\u932f\u8aa4\uff1a\u57fa\u65bc\u4e0d\u6e96\u78ba\u7684\u6578\u64da\u505a\u51fa\u7684\u6c7a\u7b56\u53ef\u80fd\u6703\u5c0d\u696d\u52d9\u9020\u6210\u640d\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-wzsEaLlXdU\">\u5982\u4f55\u67e5\u627e\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u67e5\u627e\u91cd\u8907\u6578\u64da\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 <code>GROUP BY<\/code> \u548c <code>HAVING<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u67e5\u91cd\u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT column_name, COUNT(*)\nFROM table_name\nGROUP BY column_name\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>column_name<\/code> \u662f\u4f60\u60f3\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u540d\uff0c<code>table_name<\/code> \u662f\u4f60\u7684\u6578\u64da\u8868\u540d\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u503c\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e7%9a%84%e9%9b%bb%e5%ad%90%e9%83%b5%e4%bb%b6%e5%9c%b0%e5%9d%80-wzsEaLlXdU\">\u7bc4\u4f8b\uff1a\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868 <code>Users<\/code>\uff0c\u5176\u4e2d\u5305\u542b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/p>\n<pre><code>SELECT Email, COUNT(*)\nFROM Users\nGROUP BY Email\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\uff0c\u5e6b\u52a9\u6211\u5011\u8b58\u5225\u9700\u8981\u6e05\u7406\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%aa%97%e5%8f%a3%e5%87%bd%e6%95%b8%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-wzsEaLlXdU\">\u4f7f\u7528\u7a97\u53e3\u51fd\u6578\u67e5\u627e\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528 <code>GROUP BY<\/code>\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u5229\u7528 SQL Server \u7684\u7a97\u53e3\u51fd\u6578\u4f86\u67e5\u627e\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT Email, \n           ROW_NUMBER() OVER (PARTITION BY Email ORDER BY (SELECT NULL)) AS RowNum\n    FROM Users\n)\nSELECT Email\nFROM CTE\nWHERE RowNum &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86\u516c\u5171\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u4f86\u70ba\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u5206\u914d\u4e00\u500b\u884c\u865f\u3002\u7136\u5f8c\uff0c\u6211\u5011\u9078\u64c7\u884c\u865f\u5927\u65bc 1 \u7684\u8a18\u9304\uff0c\u9019\u6a23\u5c31\u80fd\u627e\u5230\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h2 id=\"%e6%b8%85%e7%90%86%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-wzsEaLlXdU\">\u6e05\u7406\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u6578\u64da\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u6e05\u7406\u9019\u4e9b\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528 <code>DELETE<\/code> \u8a9e\u53e5\u4f86\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT *, \n           ROW_NUMBER() OVER (PARTITION BY Email ORDER BY (SELECT NULL)) AS RowNum\n    FROM Users\n)\nDELETE FROM CTE\nWHERE RowNum &gt; 1;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ea\u4fdd\u7559\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u7684\u7b2c\u4e00\u500b\u51fa\u73fe\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-wzsEaLlXdU\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\u67e5\u627e\u548c\u6e05\u7406\u91cd\u8907\u6578\u64da\u662f\u4e00\u9805\u91cd\u8981\u7684\u4efb\u52d9\uff0c\u80fd\u5920\u5e6b\u52a9\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u4f7f\u7528 <code>GROUP BY<\/code>\u3001<code>HAVING<\/code> \u548c\u7a97\u53e3\u51fd\u6578\u7b49\u6280\u8853\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u8655\u7406\u91cd\u8907\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 SQL Server \u4e2d\u6709\u6548\u67e5\u91cd\uff0c\u638c\u63e1\u6b63\u78ba\u7684\u6bd4\u5c0d\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u6e96\u78ba\u6027\u8207\u67e5\u8a62\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-153247","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153247","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=153247"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153247\/revisions"}],"predecessor-version":[{"id":153248,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153247\/revisions\/153248"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}