sql - 只为多个选择定义一次子选择查询

Question

我正在编写一个选择查询，我必须在两个地方编写相同的子查询

select e.MasterAccNumber from (
select MasterAccNumber from ACE_AccsLevelTran where CAST(timstmp as DATE) = '02/06/2013' 
union all
select m.AccountNumber from ACE_InvLevelTran i left join ACE_InvLevelMaster m i.MasterInvNumber=m.InvoiceNo 
where CAST(i.timstmp as date) ='02/06/2013' ) as e where e.MasterAccNumber not in( 
select e.MasterAccNumber from e group by e.MasterAccNumber having COUNT( e.MasterAccNumber) > 1 )

在最后一个子查询中，解析器无法理解对象 e

select e.MasterAccNumber from e group by e.MasterAccNumber having COUNT( e.MasterAccNumber) > 1 

如何写这样我就不会多次定义“e”。

Answer 1

select MasterAccNumber from 
(
select MasterAccNumber from ACE_AccsLevelTran where CAST(timstmp as DATE) = '02/06/2013' 
union all
select m.AccountNumber from ACE_InvLevelTran i 
left join ACE_InvLevelMaster m i.MasterInvNumber=m.InvoiceNo 
where CAST(i.timstmp as date) ='02/06/2013' 
)  e
group by MasterAccNumber 
having COUNT( MasterAccNumber) < 2