{"id":180166,"date":"2024-11-09T07:57:17","date_gmt":"2024-11-08T23:57:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180166\/"},"modified":"2024-11-09T07:57:18","modified_gmt":"2024-11-08T23:57:18","slug":"%e5%88%aa%e9%99%a4mssql%e4%b8%ad%e6%8c%87%e5%ae%9a%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88mssql%e5%88%aa%e9%99%a4%e6%8c%87%e5%ae%9a%e9%87%8d%e8%a4%87%e5%80%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180166\/","title":{"rendered":"\u522a\u9664MSSQL\u4e2d\u6307\u5b9a\u91cd\u8907\u503c\u7684\u65b9\u6cd5\uff08mssql\u522a\u9664\u6307\u5b9a\u91cd\u8907\u503c\uff09"},"content":{"rendered":"<h1 id=\"%e5%88%aa%e9%99%a4mssql%e4%b8%ad%e6%8c%87%e5%ae%9a%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95-Eznmgnowuv\">\u522a\u9664MSSQL\u4e2d\u6307\u5b9a\u91cd\u8907\u503c\u7684\u65b9\u6cd5<\/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\u4f7f\u7528Microsoft SQL Server\uff08MSSQL\uff09\u6642\u3002\u91cd\u8907\u7684\u6578\u64da\u4e0d\u50c5\u6703\u4f54\u7528\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u7d50\u679c\u7684\u4e0d\u6e96\u78ba\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u522a\u9664MSSQL\u4e2d\u7684\u6307\u5b9a\u91cd\u8907\u503c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u503c\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e8%ad%98%e5%88%a5-Eznmgnowuv\">\u91cd\u8907\u503c\u7684\u8b58\u5225<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u503c\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u54ea\u4e9b\u6578\u64da\u662f\u91cd\u8907\u7684\u3002\u901a\u5e38\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528GROUP BY\u8a9e\u53e5\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u67e5\u8a62\uff0c\u7528\u65bc\u67e5\u627e\u67d0\u500b\u8868\u4e2d\u91cd\u8907\u7684\u503c\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\u9700\u8981\u6aa2\u67e5\u91cd\u8907\u7684\u5217\u540d\uff0c<code>table_name<\/code>\u662f\u8868\u7684\u540d\u7a31\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u503c\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95-Eznmgnowuv\">\u522a\u9664\u91cd\u8907\u503c\u7684\u65b9\u6cd5<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u7684\u6578\u64da\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u522a\u9664\u5b83\u5011\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-Eznmgnowuv\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u4f7f\u7528CTE\u662f\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u503c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528CTE\u522a\u9664\u91cd\u8907\u503c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY column_name ORDER BY (SELECT NULL)) AS row_num\n    FROM table_name\n)\nDELETE FROM CTE WHERE row_num &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>ROW_NUMBER()<\/code>\u51fd\u6578\u70ba\u6bcf\u4e00\u7d44\u91cd\u8907\u7684\u8a18\u9304\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u884c\u865f\uff0c\u7136\u5f8c\u522a\u9664\u884c\u865f\u5927\u65bc1\u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%aa%e9%80%a3%e6%8e%a5-Eznmgnowuv\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u81ea\u9023\u63a5<\/h3>\n<p>\u53e6\u4e00\u7a2e\u522a\u9664\u91cd\u8907\u503c\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u81ea\u9023\u63a5\u3002\u4ee5\u4e0b\u662f\u76f8\u61c9\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELETE t1\nFROM table_name t1\nINNER JOIN table_name t2 \nON t1.column_name = t2.column_name\nWHERE t1.id &gt; t2.id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>t1<\/code>\u548c<code>t2<\/code>\u662f\u540c\u4e00\u500b\u8868\u7684\u5169\u500b\u5225\u540d\u3002\u9019\u500b\u67e5\u8a62\u5c07\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ea\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u4e00\u500b\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8-Eznmgnowuv\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u81e8\u6642\u8868<\/h3>\n<p>\u5982\u679c\u9700\u8981\u66f4\u9748\u6d3b\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u81e8\u6642\u8868\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u81e8\u6642\u8868\u522a\u9664\u91cd\u8907\u503c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT DISTINCT *\nINTO #TempTable\nFROM table_name;\n\nDELETE FROM table_name;\n\nINSERT INTO table_name\nSELECT *\nFROM #TempTable;<\/code><\/pre>\n<p>\u9019\u500b\u65b9\u6cd5\u9996\u5148\u5c07\u6240\u6709\u4e0d\u91cd\u8907\u7684\u8a18\u9304\u63d2\u5165\u5230\u81e8\u6642\u8868\u4e2d\uff0c\u7136\u5f8c\u6e05\u7a7a\u539f\u59cb\u8868\uff0c\u6700\u5f8c\u5c07\u4e0d\u91cd\u8907\u7684\u8a18\u9304\u63d2\u5165\u56de\u539f\u59cb\u8868\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-Eznmgnowuv\">\u7e3d\u7d50<\/h2>\n<p>\u5728MSSQL\u4e2d\u522a\u9664\u6307\u5b9a\u91cd\u8907\u503c\u7684\u65b9\u6cd5\u6709\u591a\u7a2e\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u53ef\u4ee5\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u6cd5\u3002\u7121\u8ad6\u662f\u4f7f\u7528CTE\u3001\u81ea\u9023\u63a5\u9084\u662f\u81e8\u6642\u8868\uff0c\u4e86\u89e3\u9019\u4e9b\u6280\u8853\u90fd\u80fd\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728MSSQL\u4e2d\u522a\u9664\u6307\u5b9a\u7684\u91cd\u8907\u503c\uff0c\u7c21\u55ae\u6b65\u9a5f\u6559\u4f60\u6709\u6548\u7ba1\u7406\u6578\u64da\uff0c\u4fdd\u6301\u6578\u64da\u5eab\u6574\u6f54\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-180166","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180166","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=180166"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180166\/revisions"}],"predecessor-version":[{"id":180167,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180166\/revisions\/180167"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=180166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=180166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=180166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}