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delete from kk where Id NOT IN (Select MIN(Id) From kk Group By Tel Having Count(*)>1 --取重复里的最小的RowId记录
UNION
Select MIN(Id) From kk Group By Tel Having Count(*)=1)
SQL代码10亿行数据高效字段删除重复项
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转载自blog.csdn.net/bbyn1314/article/details/90574488
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