在SQL Server中有所不同

Question

我正在执行以下查询,

Select distinct
  a.cr_id,
  Case 
    When ca.ca_vote = 'Approve' and ca.ca_title='MANAGER' Then ca.ca_email
    When ca.ca_vote = 'Reject' Then ''
    When ca.ca_vote = 'Pending' Then ''
    When ca.ca_vote = 'IN PROCESS' Then ''
  End as ca_email
from
  credit a
  inner join credit_approvals ca on ca.c_id=a.cr_id
where 
  a.cr_cs_date between Convert(varchar(20),'11/16/2011',101) and dateadd(day,1,convert  (varchar(20),'11/16/2011',101))
order by
  a.cr_id

尽管distinct对cr_id,它仍然显示重复的值.请让我知道如何处理这个问题,以便我能够只显示不同的记录.

Answer 1

Distinct适用于所有列,而不是紧接在之后的列Distinct.

如果你有几个不同ca_email的cr_id,你会看到它们.

如果您不想这样做,则必须提出一条规则来确定重复项中的哪条记录必须保留.