{"id":140770,"date":"2024-10-31T20:56:21","date_gmt":"2024-10-31T12:56:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/140770\/"},"modified":"2024-10-31T20:56:22","modified_gmt":"2024-10-31T12:56:22","slug":"sql-server-%e6%b6%88%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sqlserver-%e6%8e%92%e9%87%8d%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/140770\/","title":{"rendered":"SQL Server \u6d88\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5\uff08sqlserver \u6392\u91cd\uff09"},"content":{"rendered":"<h1 id=\"sql-server-%e6%b6%88%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sqlserver-%e6%8e%92%e9%87%8d%ef%bc%89-xbwJlnkdCu\">SQL Server \u6d88\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5\uff08sqlserver \u6392\u91cd\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u7684\u60c5\u6cc1\u4e0b\u3002SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u8b58\u5225\u548c\u6d88\u9664\u91cd\u8907\u6578\u64da\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u6709\u6548\u7684 SQL Server \u6392\u91cd\u65b9\u6cd5\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7ba1\u7406\u5176\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%b6%88%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%ef%bc%9f-xbwJlnkdCu\">\u70ba\u4ec0\u9ebc\u9700\u8981\u6d88\u9664\u91cd\u8907\u6578\u64da\uff1f<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u53ef\u80fd\u5c0e\u81f4\u591a\u7a2e\u554f\u984c\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff1a\u76f8\u540c\u6578\u64da\u7684\u4e0d\u540c\u7248\u672c\u53ef\u80fd\u5c0e\u81f4\u6df7\u6dc6\u3002<\/li>\n<li>\u6027\u80fd\u554f\u984c\uff1a\u91cd\u8907\u6578\u64da\u6703\u589e\u52a0\u67e5\u8a62\u7684\u8ca0\u64d4\uff0c\u5f71\u97ff\u6578\u64da\u5eab\u6027\u80fd\u3002<\/li>\n<li>\u5b58\u5132\u6d6a\u8cbb\uff1a\u91cd\u8907\u6578\u64da\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-xbwJlnkdCu\">\u8b58\u5225\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u5728\u6d88\u9664\u91cd\u8907\u6578\u64da\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u5b83\u5011\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c`column1` \u548c `column2` \u662f\u9700\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h2 id=\"%e6%b6%88%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95-xbwJlnkdCu\">\u6d88\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-xbwJlnkdCu\">1. \u4f7f\u7528 CTE\uff08\u516c\u7528\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u516c\u7528\u8868\u9054\u5f0f\uff08CTE\uff09\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4f86\u6d88\u9664\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS row_num\n    FROM your_table\n)\nDELETE FROM CTE WHERE row_num &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c`ROW_NUMBER()` \u51fd\u6578\u70ba\u6bcf\u7d44\u91cd\u8907\u7684\u8a18\u9304\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\uff0c\u7136\u5f8c\u522a\u9664\u884c\u865f\u5927\u65bc 1 \u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-distinct-%e9%97%9c%e9%8d%b5%e5%ad%97-xbwJlnkdCu\">2. \u4f7f\u7528 DISTINCT \u95dc\u9375\u5b57<\/h3>\n<p>\u5982\u679c\u60a8\u53ea\u60f3\u9078\u64c7\u552f\u4e00\u7684\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528 `DISTINCT` \u95dc\u9375\u5b57\uff1a<\/p>\n<pre><code>SELECT DISTINCT column1, column2\nFROM your_table;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u552f\u4e00\u7684\u8a18\u9304\uff0c\u800c\u4e0d\u6703\u986f\u793a\u91cd\u8907\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-group-by-xbwJlnkdCu\">3. \u4f7f\u7528 GROUP BY<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528 `GROUP BY` \u4f86\u805a\u5408\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a\u6bcf\u7d44\u552f\u4e00\u8a18\u9304\u7684\u8a08\u6578\uff0c\u5e6b\u52a9\u7528\u6236\u4e86\u89e3\u91cd\u8907\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xbwJlnkdCu\">\u7e3d\u7d50<\/h2>\n<p>\u6d88\u9664\u91cd\u8907\u6578\u64da\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528 CTE\u3001DISTINCT \u548c GROUP BY \u7b49\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u652f\u6301\u548c\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL Server \u4e2d\u6d88\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u5b78\u7fd2\u6709\u6548\u7684\u6392\u91cd\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\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-140770","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/140770","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=140770"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/140770\/revisions"}],"predecessor-version":[{"id":140771,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/140770\/revisions\/140771"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=140770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=140770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=140770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}