一条语句删除重复行

--可以检测到null列重复

delete from [JCXS0201] where

USER_ID in(select User_ID u from [JCXS0201] group by User_ID having COUNT(id) >1 )

and

id not in (select MIN(id) from [JCXS0201] where USER_ID in( select User_ID from [JCXS0201] group by User_ID having COUNT(id) >1 ) )

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--不可以检测到null列重复

delete from [JCXS0201] where

USER_ID in( select User_ID u from [JCXS0201] group by User_ID having COUNT(id) >1 )

and

id not in (select MIN(id) from [JCXS0201] group by User_ID having COUNT(id) >1 )