{"id":195765,"date":"2024-11-13T17:43:19","date_gmt":"2024-11-13T09:43:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/195765\/"},"modified":"2024-11-13T17:43:20","modified_gmt":"2024-11-13T09:43:20","slug":"%e5%9c%a8oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a6%82%e4%bd%95%e5%ae%8c%e5%85%a8%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/195765\/","title":{"rendered":"\u5728Oracle\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5b8c\u5168\u522a\u9664\u91cd\u8907\u8a18\u9304"},"content":{"rendered":"<h1 id=\"%e5%9c%a8oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a6%82%e4%bd%95%e5%ae%8c%e5%85%a8%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-omqusfuhxj\">\u5728Oracle\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5b8c\u5168\u522a\u9664\u91cd\u8907\u8a18\u9304<\/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\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u5982\u4f55\u6709\u6548\u5730\u8b58\u5225\u548c\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728Oracle\u6578\u64da\u5eab\u4e2d\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\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-omqusfuhxj\">\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\u95dc\u9375\u5b57\u6bb5\u4e0a\u76f8\u540c\u3002\u70ba\u4e86\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\uff0c\u5fc5\u9808\u5b9a\u671f\u6aa2\u67e5\u4e26\u522a\u9664\u9019\u4e9b\u91cd\u8907\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e8%ad%98%e5%88%a5%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-omqusfuhxj\">\u8b58\u5225\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u5728\u522a\u9664\u91cd\u8907\u8a18\u9304\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u8b58\u5225\u5b83\u5011\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u8a18\u9304\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\u9700\u8981\u6aa2\u67e5\u7684\u5b57\u6bb5\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%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95-omqusfuhxj\">\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u6709\u5e7e\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8rowid-omqusfuhxj\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROWID<\/h3>\n<p>\u6bcf\u689d\u8a18\u9304\u5728Oracle\u4e2d\u90fd\u6709\u4e00\u500b\u552f\u4e00\u7684ROWID\uff0c\u53ef\u4ee5\u5229\u7528\u9019\u4e00\u7279\u6027\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>DELETE FROM your_table\nWHERE ROWID NOT IN (\n    SELECT MIN(ROWID)\n    FROM your_table\n    GROUP BY column1, column2\n);<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u91cd\u8907\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8cte%ef%bc%88%e5%85%ac%e7%94%a8%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%89-omqusfuhxj\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09<\/h3>\n<p>\u4f7f\u7528CTE\u53ef\u4ee5\u66f4\u6e05\u6670\u5730\u8868\u9054\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u908f\u8f2f\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>WITH duplicates AS (\n    SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY ROWID) AS rn\n    FROM your_table\n)\nDELETE FROM duplicates\nWHERE rn &gt; 1;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u70ba\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u5206\u914d\u4e00\u500b\u884c\u865f\uff0c\u7136\u5f8c\u522a\u9664\u884c\u865f\u5927\u65bc1\u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8%e8%87%aa%e9%80%a3%e6%8e%a5-omqusfuhxj\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528\u81ea\u9023\u63a5<\/h3>\n<p>\u81ea\u9023\u63a5\u662f\u4e00\u7a2e\u901a\u904e\u5c07\u8868\u8207\u81ea\u8eab\u9032\u884c\u9023\u63a5\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>DELETE FROM your_table a\nWHERE EXISTS (\n    SELECT 1\n    FROM your_table b\n    WHERE a.column1 = b.column1\n    AND a.column2 = b.column2\n    AND a.ROWID &gt; b.ROWID\n);<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u522a\u9664\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u53ea\u4fdd\u7559ROWID\u6700\u5c0f\u7684\u90a3\u4e00\u689d\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-omqusfuhxj\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u4e00\u500b\u91cd\u8981\u7684\u7dad\u8b77\u4efb\u52d9\uff0c\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\uff0c\u5305\u62ec\u4f7f\u7528ROWID\u3001CTE\u548c\u81ea\u9023\u63a5\u7b49\u6280\u8853\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u67e5\u8a62\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728Oracle\u6578\u64da\u5eab\u4e2d\u6709\u6548\u5730\u8b58\u5225\u548c\u5b8c\u5168\u522a\u9664\u91cd\u8907\u8a18\u9304\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\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-195765","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195765","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=195765"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195765\/revisions"}],"predecessor-version":[{"id":195766,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195765\/revisions\/195766"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=195765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=195765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=195765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}