{"id":167959,"date":"2024-11-06T08:20:22","date_gmt":"2024-11-06T00:20:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/167959\/"},"modified":"2024-11-06T08:20:23","modified_gmt":"2024-11-06T00:20:23","slug":"%e5%85%a9%e7%a8%aesql%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%83%85%e6%b3%81","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/167959\/","title":{"rendered":"\u5169\u7a2eSQL\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u60c5\u6cc1"},"content":{"rendered":"<h1 id=\"%e5%85%a9%e7%a8%aesql%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%83%85%e6%b3%81-FIKjihMhLm\">\u5169\u7a2eSQL\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u60c5\u6cc1<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\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\u9664\u91cd\u8907\u8a18\u9304\u662f\u6bcf\u4f4d\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5169\u7a2e\u5e38\u898b\u7684SQL\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-FIKjihMhLm\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h2>\n<p>\u5728SQL Server\u548c\u5176\u4ed6\u652f\u6301\u7a97\u53e3\u51fd\u6578\u7684\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>ROW_NUMBER()<\/code>\u51fd\u6578\u4f86\u6a19\u8b58\u91cd\u8907\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u57fa\u672c\u601d\u8def\u662f\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<pre><code>WITH CTE AS (\n    SELECT \n        *,\n        ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS row_num\n    FROM \n        your_table\n)\nDELETE FROM CTE WHERE row_num &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>PARTITION BY<\/code>\u5b50\u53e5\u6307\u5b9a\u4e86\u7528\u65bc\u8b58\u5225\u91cd\u8907\u8a18\u9304\u7684\u5217\uff08\u4f8b\u5982<code>column1<\/code>\u548c<code>column2<\/code>\uff09\u3002<code>ORDER BY (SELECT NULL)<\/code>\u5247\u8868\u793a\u4e0d\u95dc\u5fc3\u884c\u7684\u9806\u5e8f\u3002\u6700\u7d42\uff0c<code>DELETE<\/code>\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u884c\u865f\u5927\u65bc1\u7684\u8a18\u9304\uff0c\u5f9e\u800c\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8group-by%e5%92%8chaving%e5%ad%90%e5%8f%a5-FIKjihMhLm\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528GROUP BY\u548cHAVING\u5b50\u53e5<\/h2>\n<p>\u53e6\u4e00\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u5b50\u53e5\u4f86\u8b58\u5225\u91cd\u8907\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u9069\u7528\u65bcMySQL\u7b49\u4e0d\u652f\u6301\u7a97\u53e3\u51fd\u6578\u7684\u6578\u64da\u5eab\u3002<\/p>\n<pre><code>DELETE FROM your_table\nWHERE id NOT IN (\n    SELECT MIN(id)\n    FROM your_table\n    GROUP BY column1, column2\n);<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u9996\u5148\u4f7f\u7528<code>GROUP BY<\/code>\u5b50\u53e5\u4f86\u5206\u7d44\u91cd\u8907\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u4f7f\u7528<code>MIN(id)<\/code>\u4f86\u9078\u64c7\u6bcf\u7d44\u4e2d\u7684\u6700\u5c0fID\u3002\u63a5\u8457\uff0c<code>DELETE<\/code>\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u4e0d\u5728\u9019\u4e9b\u6700\u5c0fID\u4e2d\u7684\u8a18\u9304\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u53ea\u4fdd\u7559\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-FIKjihMhLm\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u8a18\u9304\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u9032\u884c\u6578\u64da\u5099\u4efd\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002\u6b64\u5916\uff0c\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u61c9\u8a72\u4ed4\u7d30\u6aa2\u67e5\u689d\u4ef6\uff0c\u4ee5\u78ba\u4fdd\u4e0d\u6703\u522a\u9664\u932f\u8aa4\u7684\u8a18\u9304\u3002\u53ef\u4ee5\u5148\u4f7f\u7528<code>SELECT<\/code>\u8a9e\u53e5\u4f86\u6aa2\u67e5\u5c07\u8981\u522a\u9664\u7684\u8a18\u9304\uff0c\u78ba\u4fdd\u64cd\u4f5c\u7684\u6b63\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FIKjihMhLm\">\u7e3d\u7d50<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u7684\u522a\u9664\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u4efb\u52d9\u3002\u901a\u904e\u4f7f\u7528<code>ROW_NUMBER()<\/code>\u51fd\u6578\u6216<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u5b50\u53e5\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u6709\u6548\u5730\u6e05\u7406\u6578\u64da\uff0c\u4fdd\u6301\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5169\u7a2eSQL\u65b9\u6cd5\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u8207\u6e96\u78ba\u6027\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-167959","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167959","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=167959"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167959\/revisions"}],"predecessor-version":[{"id":167960,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167959\/revisions\/167960"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=167959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=167959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=167959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}