Question

我选择所有基于任何给定记录的重复记录（而不是简单地选择哪些字段具有重复记录：

select T1.SN,T1.C,T1.S, T2.cnt
from LS T1
join (
  Select SN,C,S,Count(*) as cnt from LS 
where (C in ('M','B','Q','SI','X') and S='N') group by SN having count(*)>1
) as T2 on T1.SN=T2.SN and (T1.C in ('M','B','Q','SI','X') and T1.S='N')

我想将FieldY更新为＆＃39; 1＆＃39;对于这些选定的记录。

Answer 1

我试过这个似乎有用，不确定它是否理想：

Update LS as U1
Inner Join (
select T1.ID,T1.SN,T1.C,T1.S, T2.cnt
from LS T1
join (
  Select SN,C,S,Count(*) as cnt from LS 
where (C in ('M','B','Q','SI','X') and S='N') group by SN having count(*)>1
) as T2 on T1.SN=T2.SN and (T1.C in ('M','B','Q','SI','X') and T1.S='N')) as U2 
On U1.ID=U2.ID set FieldY='1'

从组中选择后更新记录

1 个答案: