DELETE from tiaoyaxiang_bk WHERE tyx_id IN (SELECT tyx_id FROM tiaoyaxiang_bk GROUP BY tyx_id HAVING COUNT(tyx_id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM tiaoyaxiang_bk GROUP BY tyx_id HAVING COUNT(*) > 1);
删除重复记录,并保留一条记录
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转载自peijunlin2008.iteye.com/blog/2287222
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