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--P_CODE 重复列 DELETE FROM Tab WHERE P_CODE IN (SELECT P_CODE FROM Tab GROUP BY P_CODE HAVING COUNT(P_CODE) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM Tab GROUP BY P_CODE HAVING COUNT(*) > 1);
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原文地址：http://www.cnblogs.com/zzzzbk/p/5915649.html
