{"id":94618,"date":"2024-10-19T19:45:19","date_gmt":"2024-10-19T11:45:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94618\/"},"modified":"2024-10-19T19:45:19","modified_gmt":"2024-10-19T11:45:19","slug":"oracle-%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e6%aa%a2%e6%9f%a5%e8%88%87%e6%b8%85%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-oracle-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e9%87%8d%e8%a4%87%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94618\/","title":{"rendered":"Oracle \u6578\u64da\u5eab\uff1a\u6aa2\u67e5\u8207\u6e05\u9664\u91cd\u8907\u6578\u64da (oracle \u6aa2\u67e5\u6578\u64da\u91cd\u8907\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"oracle-%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e6%aa%a2%e6%9f%a5%e8%88%87%e6%b8%85%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-cLUBorLtIo\">Oracle \u6578\u64da\u5eab\uff1a\u6aa2\u67e5\u8207\u6e05\u9664\u91cd\u8907\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u7ba1\u7406\u4e2d\uff0c\u91cd\u8907\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u5c24\u5176\u662f\u5728\u5927\u578b\u6578\u64da\u5eab\u4e2d\u3002Oracle \u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u65b9\u6cd5\u4f86\u6aa2\u67e5\u548c\u6e05\u9664\u91cd\u8907\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 Oracle \u6578\u64da\u5eab\u4e2d\u6aa2\u67e5\u548c\u6e05\u9664\u91cd\u8907\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%aa%a2%e6%9f%a5%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a-cLUBorLtIo\">\u70ba\u4ec0\u9ebc\u9700\u8981\u6aa2\u67e5\u91cd\u8907\u6578\u64da<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u4e26\u589e\u52a0\u5b58\u5132\u6210\u672c\u3002\u7576\u6578\u64da\u5eab\u4e2d\u5b58\u5728\u91cd\u8907\u8a18\u9304\u6642\uff0c\u5831\u544a\u548c\u5206\u6790\u7684\u6e96\u78ba\u6027\u4e5f\u6703\u53d7\u5230\u5f71\u97ff\u3002\u56e0\u6b64\uff0c\u5b9a\u671f\u6aa2\u67e5\u548c\u6e05\u9664\u91cd\u8907\u6578\u64da\u662f\u6578\u64da\u7ba1\u7406\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e6%aa%a2%e6%9f%a5%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95-cLUBorLtIo\">\u6aa2\u67e5\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 SQL \u67e5\u8a62\u4f86\u6aa2\u67e5\u91cd\u8907\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u67e5\u8a62\u793a\u4f8b\uff0c\u7528\u65bc\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>\nSELECT column_name, COUNT(*)\nFROM table_name\nGROUP BY column_name\nHAVING COUNT(*) &gt; 1;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u60a8\u9700\u8981\u5c07 <code>column_name<\/code> \u66ff\u63db\u70ba\u60a8\u8981\u6aa2\u67e5\u7684\u5217\u540d\uff0c<code>table_name<\/code> \u66ff\u63db\u70ba\u60a8\u7684\u8868\u540d\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<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e6%9f%a5%e6%89%be%e9%87%8d%e8%a4%87%e7%9a%84%e9%9b%bb%e5%ad%90%e9%83%b5%e4%bb%b6%e5%9c%b0%e5%9d%80-cLUBorLtIo\">\u793a\u4f8b\uff1a\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740<\/h3>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u60a8\u60f3\u8981\u67e5\u627e\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT email, COUNT(*)\nFROM users\nGROUP BY email\nHAVING COUNT(*) &gt; 1;\n<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u91cd\u8907\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u53ca\u5176\u51fa\u73fe\u7684\u6b21\u6578\u3002<\/p>\n<h2 id=\"%e6%b8%85%e9%99%a4%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e6%b3%95-cLUBorLtIo\">\u6e05\u9664\u91cd\u8907\u6578\u64da\u7684\u65b9\u6cd5<\/h2>\n<p>\u4e00\u65e6\u6aa2\u67e5\u51fa\u91cd\u8907\u6578\u64da\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u6e05\u9664\u9019\u4e9b\u91cd\u8907\u7684\u8a18\u9304\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u4f86\u522a\u9664\u91cd\u8907\u6578\u64da\uff1a<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-rowid-%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-cLUBorLtIo\">\u4f7f\u7528 ROWID \u522a\u9664\u91cd\u8907\u8a18\u9304<\/h3>\n<p>Oracle \u6578\u64da\u5eab\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u6709\u4e00\u500b\u552f\u4e00\u7684 ROWID\u3002\u53ef\u4ee5\u5229\u7528\u9019\u4e00\u7279\u6027\u4f86\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nDELETE FROM users\nWHERE ROWID NOT IN (\n    SELECT MIN(ROWID)\n    FROM users\n    GROUP BY email\n);\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u4fdd\u7559\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u7b2c\u4e00\u500b\u51fa\u73fe\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u91cd\u8907\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-cLUBorLtIo\">\u4f7f\u7528 CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528 CTE \u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nWITH duplicates AS (\n    SELECT email, ROW_NUMBER() OVER (PARTITION BY email ORDER BY ROWID) AS rn\n    FROM users\n)\nDELETE FROM duplicates\nWHERE rn &gt; 1;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u70ba\u6bcf\u500b\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u5206\u914d\u4e00\u500b\u884c\u865f\uff0c\u4e26\u522a\u9664\u884c\u865f\u5927\u65bc 1 \u7684\u6240\u6709\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cLUBorLtIo\">\u7e3d\u7d50<\/h2>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u6aa2\u67e5\u548c\u6e05\u9664\u91cd\u8907\u6578\u64da\u662f\u78ba\u4fdd\u6578\u64da\u8cea\u91cf\u548c\u4e00\u81f4\u6027\u7684\u95dc\u9375\u6b65\u9a5f\u3002\u901a\u904e\u4f7f\u7528 SQL \u67e5\u8a62\u548c\u9069\u7576\u7684\u522a\u9664\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u91cd\u8907\u8a18\u9304\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\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u8cc7\u6e90\u914d\u7f6e\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728Oracle\u6578\u64da\u5eab\u4e2d\u6aa2\u67e5\u8207\u6e05\u9664\u91cd\u8907\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\u8207\u7cfb\u7d71\u6548\u80fd\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-94618","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94618","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=94618"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94618\/revisions"}],"predecessor-version":[{"id":94619,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94618\/revisions\/94619"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}