删除表中重复记录大于两条保存两条

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--删除表中重复记录大于两条保存两条
delete from t_Cht_clm_reg F where F.case_id in (
select T.case_id from (
select B.* from (select e.* , row_number() over (partition by e.notice_id order by e.case_id desc) rn
from t_Cht_clm_reg e) B where B.notice_id in(
select A.notice_id from (select e.* , row_number() over (partition by e.notice_id order by e.case_id desc) rn
from t_Cht_clm_reg e) A group by A.notice_id having count(A.notice_id) > 2 )
) T where T.RN > 2 )

删除表中重复记录大于两条保存两条

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原文地址：http://www.cnblogs.com/nuaaydh/p/4341788.html