{"id":143899,"date":"2024-11-01T02:11:17","date_gmt":"2024-10-31T18:11:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143899\/"},"modified":"2024-11-01T02:11:18","modified_gmt":"2024-10-31T18:11:18","slug":"sql-%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e6%b2%92%e6%9c%89%e5%a4%a7%e5%b0%8f%e9%97%9c%e4%bf%82%e6%99%82%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e8%99%95%e7%90%86%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143899\/","title":{"rendered":"SQL \u522a\u9664\u91cd\u8907\u8a18\u9304\u6c92\u6709\u5927\u5c0f\u95dc\u4fc2\u6642\u91cd\u8907\u503c\u7684\u8655\u7406\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"sql-%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e6%b2%92%e6%9c%89%e5%a4%a7%e5%b0%8f%e9%97%9c%e4%bf%82%e6%99%82%e9%87%8d%e8%a4%87%e5%80%bc%e7%9a%84%e8%99%95%e7%90%86%e6%96%b9%e6%b3%95-XgxYaObqwN\">SQL \u522a\u9664\u91cd\u8907\u8a18\u9304\u6c92\u6709\u5927\u5c0f\u95dc\u4fc2\u6642\u91cd\u8907\u503c\u7684\u8655\u7406\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u8a18\u9304\u7684\u5b58\u5728\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\u548c\u67e5\u8a62\u6548\u7387\u7684\u964d\u4f4e\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528 SQL \u9032\u884c\u6578\u64da\u64cd\u4f5c\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u522a\u9664\u91cd\u8907\u8a18\u9304\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u6c92\u6709\u5927\u5c0f\u95dc\u4fc2\u7684\u60c5\u6cc1\u4e0b\uff0c\u5982\u4f55\u8655\u7406 SQL \u4e2d\u7684\u91cd\u8907\u503c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e5%ae%9a%e7%be%a9-XgxYaObqwN\">\u91cd\u8907\u8a18\u9304\u7684\u5b9a\u7fa9<\/h2>\n<p>\u91cd\u8907\u8a18\u9304\u662f\u6307\u5728\u6578\u64da\u8868\u4e2d\u5b58\u5728\u591a\u689d\u76f8\u540c\u7684\u8a18\u9304\u3002\u9019\u4e9b\u8a18\u9304\u53ef\u80fd\u5728\u67d0\u4e9b\u5b57\u6bb5\u4e0a\u5b8c\u5168\u76f8\u540c\uff0c\u6216\u8005\u5728\u67d0\u4e9b\u5b57\u6bb5\u4e0a\u76f8\u540c\u800c\u5728\u5176\u4ed6\u5b57\u6bb5\u4e0a\u4e0d\u540c\u3002\u7576\u6211\u5011\u9700\u8981\u522a\u9664\u9019\u4e9b\u91cd\u8907\u8a18\u9304\u6642\uff0c\u9996\u5148\u9700\u8981\u660e\u78ba\u54ea\u4e9b\u5b57\u6bb5\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-XgxYaObqwN\">\u4f7f\u7528 SQL \u522a\u9664\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u5e38\u898b\u65b9\u6cd5\u662f\u4f7f\u7528 <code>DELETE<\/code> \u8a9e\u53e5\u7d50\u5408 <code>ROW_NUMBER()<\/code> \u51fd\u6578\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u7684\u884c\u3002\u4ee5\u4e0b\u662f\u5177\u9ad4\u7684\u6b65\u9a5f\u548c\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%80%ef%bc%9a%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-XgxYaObqwN\">\u6b65\u9a5f\u4e00\uff1a\u8b58\u5225\u91cd\u8907\u8a18\u9304<\/h3>\n<p>\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \u51fd\u6578\u4f86\u70ba\u6bcf\u4e00\u689d\u8a18\u9304\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\u3002\u9019\u500b\u5e8f\u865f\u662f\u6839\u64da\u6211\u5011\u6307\u5b9a\u7684\u91cd\u8907\u5b57\u6bb5\u9032\u884c\u6392\u5e8f\u7684\u3002<\/p>\n<pre><code>\nWITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS rn\n    FROM your_table\n)\nSELECT * FROM CTE WHERE rn &gt; 1;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>column1<\/code> \u548c <code>column2<\/code> \u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5b57\u6bb5\u3002\u9019\u6bb5\u4ee3\u78bc\u6703\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u4e26\u70ba\u6bcf\u4e00\u689d\u8a18\u9304\u5206\u914d\u4e00\u500b\u5e8f\u865f\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%8c%ef%bc%9a%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-XgxYaObqwN\">\u6b65\u9a5f\u4e8c\uff1a\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h3>\n<p>\u4e00\u65e6\u6211\u5011\u8b58\u5225\u4e86\u91cd\u8907\u7684\u8a18\u9304\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 <code>DELETE<\/code> \u8a9e\u53e5\u4f86\u522a\u9664\u5b83\u5011\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nWITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY (SELECT NULL)) AS rn\n    FROM your_table\n)\nDELETE FROM CTE WHERE rn &gt; 1;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ea\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e8%80%83%e6%85%ae%e5%a4%a7%e5%b0%8f%e5%af%ab%e7%9a%84%e5%bd%b1%e9%9f%bf-XgxYaObqwN\">\u8003\u616e\u5927\u5c0f\u5beb\u7684\u5f71\u97ff<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u91cd\u8907\u8a18\u9304\u7684\u5224\u65b7\u53ef\u80fd\u6703\u53d7\u5230\u5927\u5c0f\u5beb\u7684\u5f71\u97ff\u3002\u4f8b\u5982\uff0c<code>'abc'<\/code> \u548c <code>'ABC'<\/code> \u53ef\u80fd\u88ab\u8996\u70ba\u4e0d\u540c\u7684\u8a18\u9304\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>LOWER()<\/code> \u6216 <code>UPPER()<\/code> \u51fd\u6578\u4f86\u7d71\u4e00\u5927\u5c0f\u5beb\uff1a<\/p>\n<pre><code>\nWITH CTE AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY LOWER(column1), LOWER(column2) ORDER BY (SELECT NULL)) AS rn\n    FROM your_table\n)\nDELETE FROM CTE WHERE rn &gt; 1;\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XgxYaObqwN\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u4e2d\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u6578\u64da\u6e05\u7406\u548c\u6578\u64da\u5eab\u7dad\u8b77\u7684\u904e\u7a0b\u4e2d\u3002\u901a\u904e\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\uff0c\u800c\u4e0d\u5fc5\u64d4\u5fc3\u5927\u5c0f\u5beb\u7684\u554f\u984c\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7684\u6574\u6f54\u6027\uff0c\u9084\u80fd\u63d0\u5347\u67e5\u8a62\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u7ba1\u7406\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u512a\u5316\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL \u4e2d\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u7121\u8ad6\u5927\u5c0f\u95dc\u4fc2\uff0c\u4e26\u6709\u6548\u8655\u7406\u91cd\u8907\u503c\u7684\u591a\u7a2e\u65b9\u6cd5\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-143899","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143899","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=143899"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143899\/revisions"}],"predecessor-version":[{"id":143900,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143899\/revisions\/143900"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}