{"id":199959,"date":"2025-05-06T11:12:37","date_gmt":"2025-05-06T03:12:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199959\/"},"modified":"2025-05-06T11:12:37","modified_gmt":"2025-05-06T03:12:37","slug":"%e5%9c%a8oracle%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e5%a6%82%e4%bd%95%e8%bf%87%e6%bb%a4%e5%87%ba%e5%94%af%e4%b8%80%e7%9a%84%e9%87%8d%e5%a4%8d%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199959\/","title":{"rendered":"\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5982\u4f55\u8fc7\u6ee4\u51fa\u552f\u4e00\u7684\u91cd\u590d\u6570\u636e\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5982\u4f55\u8fc7\u6ee4\u51fa\u552f\u4e00\u7684\u91cd\u590d\u6570\u636e\uff1f<\/h1>\n<p>\u5728\u6570\u636e\u5e93\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u4e3b\u673a\u5b9d\u8d1d\u5c31\u6574\u7406\u5206\u4eab\u300a\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5982\u4f55\u8fc7\u6ee4\u51fa\u552f\u4e00\u7684\u91cd\u590d\u6570\u636e\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p>\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4ec5\u63d0\u53d6\u4e00\u6761\u91cd\u590d\u6570\u636e\uff1f<\/p>\n<p>\u5728\u65e5\u5e38\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u9700\u8981\u63d0\u53d6\u91cd\u590d\u6570\u636e\u7684\u60c5\u51b5\u3002\u6709\u65f6\u5019\u6211\u4eec\u5e0c\u671b\u627e\u51fa\u91cd\u590d\u6570\u636e\u4e2d\u7684\u4e00\u6761\uff0c\u800c\u4e0d\u662f\u5c06\u6240\u6709\u91cd\u590d\u6570\u636e\u90fd\u5217\u51fa\u6765\u3002\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u52a9\u4e00\u4e9bSQL\u8bed\u53e5\u6765\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u7684\u3002\u63a5\u4e0b\u6765\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4ec5\u63d0\u53d6\u4e00\u6761\u91cd\u590d\u6570\u636e\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<h3>1. \u4f7f\u7528ROWID\u51fd\u6570<\/h3>\n<p>ROWID\u662fOracle\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u4e2a\u4f2a\u5217\uff0c\u53ef\u4ee5\u8fd4\u56de\u6bcf\u4e00\u884c\u6570\u636e\u7684\u7269\u7406\u5730\u5740\u3002\u901a\u8fc7\u4f7f\u7528ROWID\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u5728\u91cd\u590d\u6570\u636e\u4e2d\u4ec5\u63d0\u53d6\u4e00\u6761\u3002<\/p>\n<pre>SELECT *\nFROM your_table\nWHERE ROWID IN (\n    SELECT MIN(ROWID)\n    FROM your_table\n    GROUP BY column1, column2, ...\n    HAVING COUNT(*) &gt; 1\n);<\/pre>\n<p>\u4e0a\u9762\u7684SQL\u8bed\u53e5\u4e2d\uff0cyour_table\u662f\u4f60\u8981\u67e5\u8be2\u7684\u8868\u540d\uff0ccolumn1\u3001column2\u7b49\u662f\u7528\u6765\u5224\u65ad\u91cd\u590d\u7684\u5217\u540d\u3002\u901a\u8fc7\u5bf9ROWID\u8fdb\u884cMIN\u64cd\u4f5c\uff0c\u6211\u4eec\u53ef\u4ee5\u53ea\u9009\u53d6\u91cd\u590d\u6570\u636e\u4e2d\u7684\u7b2c\u4e00\u6761\u3002<\/p>\n<h3>2. \u4f7f\u7528ROW_NUMBER\u51fd\u6570<\/h3>\n<p>ROW_NUMBER\u51fd\u6570\u662fOracle\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u4e2a\u7a97\u53e3\u51fd\u6570\uff0c\u53ef\u4ee5\u4e3a\u7ed3\u679c\u96c6\u4e2d\u7684\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u5e8f\u53f7\u3002\u901a\u8fc7\u4f7f\u7528ROW_NUMBER\u51fd\u6570\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u5728\u91cd\u590d\u6570\u636e\u4e2d\u4ec5\u63d0\u53d6\u4e00\u6761\u3002<\/p>\n<pre>SELECT *\nFROM (\n    SELECT t.*, ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY column1) AS rn\n    FROM your_table t\n) WHERE rn = 1;<\/pre>\n<p>\u8fd9\u91cc\u7684SQL\u8bed\u53e5\u4e2d\uff0cyour_table\u662f\u4f60\u8981\u67e5\u8be2\u7684\u8868\u540d\uff0ccolumn1\u3001column2\u662f\u7528\u6765\u5224\u65ad\u91cd\u590d\u7684\u5217\u540d\u3002\u901a\u8fc7PARTITION BY\u5b50\u53e5\u6307\u5b9a\u4e86\u54ea\u4e9b\u5217\u7528\u4e8e\u5224\u65ad\u91cd\u590d\u6570\u636e\uff0c\u800cORDER BY\u5b50\u53e5\u5219\u53ef\u4ee5\u6307\u5b9a\u9009\u62e9\u54ea\u6761\u6570\u636e\u3002<\/p>\n<h3>\u603b\u7ed3\uff1a<\/h3>\n<p>\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7ROWID\u51fd\u6570\u6216ROW_NUMBER\u51fd\u6570\u6765\u5b9e\u73b0\u5728\u91cd\u590d\u6570\u636e\u4e2d\u4ec5\u63d0\u53d6\u4e00\u6761\u3002\u4ee5\u4e0a\u7684\u4e24\u79cd\u65b9\u6cd5\u90fd\u80fd\u591f\u6709\u6548\u5730\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u7684\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u4e00\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u4f60\u7684\u5b9e\u9645\u9700\u6c42\u548c\u4e60\u60ef\u3002<\/p>\n<p>\u5e0c\u671b\u4ee5\u4e0a\u5185\u5bb9\u80fd\u591f\u5e2e\u52a9\u4f60\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5904\u7406\u91cd\u590d\u6570\u636e\u65f6\u66f4\u52a0\u9ad8\u6548\u548c\u4fbf\u6377\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5982\u4f55\u8fc7\u6ee4\u51fa\u552f\u4e00\u7684\u91cd\u590d\u6570\u636e\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6570\u636e\u5e93\u77e5\u8bc6\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5982\u4f55\u8fc7\u6ee4\u51fa&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199959","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199959","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199959"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199959\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}