{"id":95798,"date":"2024-10-20T04:05:16","date_gmt":"2024-10-19T20:05:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95798\/"},"modified":"2024-10-20T04:05:17","modified_gmt":"2024-10-19T20:05:17","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%aa%e9%99%a4%e8%a1%a8%e4%b8%ad%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95%e4%b8%89%e5%89%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95798\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u522a\u9664\u8868\u4e2d\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u4e09\u5247"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%aa%e9%99%a4%e8%a1%a8%e4%b8%ad%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84%e7%9a%84%e6%96%b9%e6%b3%95%e4%b8%89%e5%89%87-rKCQrXLErh\">Oracle\u6578\u64da\u5eab\u522a\u9664\u8868\u4e2d\u91cd\u8907\u8a18\u9304\u7684\u65b9\u6cd5\u4e09\u5247<\/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\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u522a\u9664\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e09\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u6e05\u7406\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8rowid%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-rKCQrXLErh\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528ROWID\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h2>\n<p>ROWID\u662fOracle\u6578\u64da\u5eab\u4e2d\u6bcf\u4e00\u884c\u7684\u552f\u4e00\u6a19\u8b58\u7b26\u3002\u5229\u7528ROWID\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u5177\u9ad4\u6b65\u9a5f\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, column3\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>your_table<\/code>\u662f\u9700\u8981\u6e05\u7406\u7684\u8868\u540d\uff0c\u800c<code>column1, column2, column3<\/code>\u662f\u7528\u4f86\u5224\u65b7\u91cd\u8907\u7684\u5217\u3002\u9019\u500b\u67e5\u8a62\u6703\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\uff0c\u4e26\u522a\u9664\u5176\u9918\u7684\u8a18\u9304\u3002<\/p>\n<h2 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%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-rKCQrXLErh\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528CTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h2>\n<p>\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u67e5\u8a62\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u66f4\u6e05\u6670\u5730\u7d44\u7e54\u67e5\u8a62\u908f\u8f2f\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528CTE\u522a\u9664\u91cd\u8907\u8a18\u9304\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH duplicates AS (\n    SELECT column1, column2, COUNT(*) AS cnt\n    FROM your_table\n    GROUP BY column1, column2\n    HAVING COUNT(*) &gt; 1\n)\nDELETE FROM your_table\nWHERE (column1, column2) IN (\n    SELECT column1, column2\n    FROM duplicates\n);\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u5b9a\u7fa9\u4e86\u4e00\u500bCTE\uff0c\u67e5\u627e\u6240\u6709\u91cd\u8907\u7684\u8a18\u9304\uff0c\u7136\u5f8c\u5728\u4e3b\u67e5\u8a62\u4e2d\u522a\u9664\u9019\u4e9b\u91cd\u8907\u7684\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5176\u53ef\u8b80\u6027\u548c\u7d50\u69cb\u5316\uff0c\u4f7f\u5f97\u67e5\u8a62\u908f\u8f2f\u66f4\u52a0\u6e05\u6670\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e4%bd%bf%e7%94%a8merge%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e9%87%8d%e8%a4%87%e8%a8%98%e9%8c%84-rKCQrXLErh\">\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528MERGE\u8a9e\u53e5\u522a\u9664\u91cd\u8907\u8a18\u9304<\/h2>\n<p>MERGE\u8a9e\u53e5\u901a\u5e38\u7528\u65bc\u5408\u4f75\u6578\u64da\uff0c\u4f46\u4e5f\u53ef\u4ee5\u7528\u4f86\u522a\u9664\u91cd\u8907\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528MERGE\u8a9e\u53e5\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>MERGE INTO your_table t\nUSING (\n    SELECT MIN(ROWID) AS min_rowid\n    FROM your_table\n    GROUP BY column1, column2\n) m\nON (t.ROWID = m.min_rowid)\nWHEN NOT MATCHED THEN\n    DELETE;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u901a\u904e\u5408\u4f75\u64cd\u4f5c\u4f86\u522a\u9664\u91cd\u8907\u7684\u8a18\u9304\uff0c\u4fdd\u7559\u6bcf\u7d44\u91cd\u8907\u8a18\u9304\u4e2d\u7684\u7b2c\u4e00\u689d\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u597d\u8655\u5728\u65bc\u5b83\u80fd\u5920\u5728\u4e00\u500b\u64cd\u4f5c\u4e2d\u5b8c\u6210\u67e5\u8a62\u548c\u522a\u9664\uff0c\u5f9e\u800c\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-rKCQrXLErh\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u522a\u9664\u91cd\u8907\u8a18\u9304\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u4efb\u52d9\u3002\u672c\u6587\u4ecb\u7d39\u4e86\u4e09\u7a2e\u6709\u6548\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528ROWID\u3001CTE\u548cMERGE\u8a9e\u53e5\u3002\u6839\u64da\u5177\u9ad4\u7684\u9700\u6c42\u548c\u6578\u64da\u7d50\u69cb\uff0c\u7528\u6236\u53ef\u4ee5\u9078\u64c7\u6700\u9069\u5408\u7684\u65b9\u6cd5\u4f86\u6e05\u7406\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6280\u8853\u652f\u6301\u6216\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u7684\u6578\u64da\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u4e09\u7a2e\u6709\u6548\u65b9\u6cd5\u5728Oracle\u6578\u64da\u5eab\u4e2d\u522a\u9664\u8868\u4e2d\u7684\u91cd\u8907\u8a18\u9304\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\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-95798","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95798","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=95798"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95798\/revisions"}],"predecessor-version":[{"id":95799,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95798\/revisions\/95799"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}