{"id":65599,"date":"2024-10-14T13:51:23","date_gmt":"2024-10-14T05:51:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/65599\/"},"modified":"2024-10-14T13:51:23","modified_gmt":"2024-10-14T05:51:23","slug":"mssql%e5%bf%ab%e6%8d%b7%e6%b8%85%e7%90%86%e9%87%8d%e8%a4%87%e9%a0%85%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88mssql%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e9%a0%85%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/65599\/","title":{"rendered":"MSSQL\u5feb\u6377\u6e05\u7406\u91cd\u8907\u9805\u7684\u65b9\u6cd5\uff08mssql\u522a\u9664\u91cd\u8907\u9805\uff09"},"content":{"rendered":"<h1 id=\"mssql%e5%bf%ab%e6%8d%b7%e6%b8%85%e7%90%86%e9%87%8d%e8%a4%87%e9%a0%85%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88mssql%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e9%a0%85%ef%bc%89-qxKaGtisPq\">MSSQL\u5feb\u6377\u6e05\u7406\u91cd\u8907\u9805\u7684\u65b9\u6cd5\uff08mssql\u522a\u9664\u91cd\u8907\u9805\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u9805\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u751a\u81f3\u9020\u6210\u696d\u52d9\u6c7a\u7b56\u7684\u932f\u8aa4\u3002\u56e0\u6b64\uff0c\u6e05\u7406\u91cd\u8907\u9805\u662f\u6578\u64da\u5eab\u7dad\u8b77\u7684\u91cd\u8981\u4efb\u52d9\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728 Microsoft SQL Server (MSSQL) \u4e2d\u5feb\u901f\u6e05\u7406\u91cd\u8907\u9805\u7684\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%b8%85%e7%90%86%e9%87%8d%e8%a4%87%e9%a0%85-qxKaGtisPq\">\u70ba\u4ec0\u9ebc\u9700\u8981\u6e05\u7406\u91cd\u8907\u9805<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u53ef\u80fd\u6703\u5c0e\u81f4\u4ee5\u4e0b\u554f\u984c\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff1a\u76f8\u540c\u7684\u6578\u64da\u5728\u4e0d\u540c\u7684\u8a18\u9304\u4e2d\u53ef\u80fd\u6703\u6709\u4e0d\u540c\u7684\u503c\u3002<\/li>\n<li>\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\uff1a\u91cd\u8907\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\u5f71\u97ff\u6574\u9ad4\u696d\u52d9\u904b\u71df\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e9%a0%85-qxKaGtisPq\">\u5982\u4f55\u8b58\u5225\u91cd\u8907\u9805<\/h2>\n<p>\u5728\u6e05\u7406\u91cd\u8907\u9805\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u54ea\u4e9b\u6578\u64da\u662f\u91cd\u8907\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u9805\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\u4f60\u60f3\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=\"%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e9%a0%85%e7%9a%84%e6%96%b9%e6%b3%95-qxKaGtisPq\">\u522a\u9664\u91cd\u8907\u9805\u7684\u65b9\u6cd5<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u91cd\u8907\u9805\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u522a\u9664\u5b83\u5011\uff1a<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8-cte-common-table-expression-qxKaGtisPq\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528 CTE (Common Table Expression)<\/h3>\n<p>\u4f7f\u7528 CTE \u662f\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u9805\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\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\u6bb5\u4ee3\u78bc\u4e2d\uff0c`ROW_NUMBER()` \u51fd\u6578\u70ba\u6bcf\u7d44\u91cd\u8907\u9805\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u522a\u9664\u5e8f\u865f\u5927\u65bc 1 \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%a8%e6%99%82%e8%a1%a8-qxKaGtisPq\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528\u81e8\u6642\u8868<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528\u81e8\u6642\u8868\u4f86\u5b58\u5132\u552f\u4e00\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u518d\u5c07\u5176\u63d2\u5165\u56de\u539f\u59cb\u8868\u4e2d\uff1a<\/p>\n<pre><code>SELECT DISTINCT *\nINTO #TempTable\nFROM your_table;\n\nDELETE FROM your_table;\n\nINSERT INTO your_table\nSELECT *\nFROM #TempTable;\n\nDROP TABLE #TempTable;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u5c07\u552f\u4e00\u7684\u8a18\u9304\u5b58\u5165\u81e8\u6642\u8868\uff0c\u7136\u5f8c\u6e05\u7a7a\u539f\u59cb\u8868\uff0c\u6700\u5f8c\u5c07\u552f\u4e00\u8a18\u9304\u63d2\u5165\u56de\u53bb\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-qxKaGtisPq\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u9805\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002\u6b64\u5916\uff0c\u61c9\u8a72\u4ed4\u7d30\u6aa2\u67e5\u91cd\u8907\u9805\u7684\u5b9a\u7fa9\uff0c\u4ee5\u78ba\u4fdd\u4e0d\u6703\u522a\u9664\u6709\u7528\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qxKaGtisPq\">\u7e3d\u7d50<\/h2>\n<p>\u6e05\u7406 MSSQL \u4e2d\u7684\u91cd\u8907\u9805\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u5eab\u7dad\u8b77\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528 CTE \u6216\u81e8\u6642\u8868\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u67e5\u8a62\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\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5feb\u901f\u5b78\u7fd2\u5982\u4f55\u5728MSSQL\u4e2d\u6709\u6548\u6e05\u7406\u91cd\u8907\u9805\uff0c\u7c21\u5316\u522a\u9664\u904e\u7a0b\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u6574\u6f54\u5ea6\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-65599","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65599","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=65599"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65599\/revisions"}],"predecessor-version":[{"id":65600,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/65599\/revisions\/65600"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=65599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=65599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=65599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}