SQL添加两个临时表

Question

我有两个临时表来计算一些ID。我想组合这些表来计算每个表的计数，然后将它们加在一起。这就是我到目前为止所拥有的。

if object_id('tempdb..#order') is not null drop table #order 
select count (a.patientSID) as 'Order Count'

into #order
from CPRSOrder.CPRSOrder a
join sstaff.SStaff b on b.staffSID = a.EnteredbyStaffSID 
join spatient.spatient c on c.patientSID = a.patientSID
where b.staffName = xxxxxxxx
and a.enteredDateTime >= '20180801' and a.enteredDateTime <= '20180828'

if object_id('tempdb..#note') is not null drop table #note 
select count (a.patientSID) as 'Note Count'

into #note
from tiu.tiudocument a
join sstaff.SStaff b on b.staffSID = a.EnteredbyStaffSID 
--join spatient.spatient c on c.patientSID = a.patientSID
where b.staffName = xxxxxxxx
and a.episodeBeginDateTime >= '20180801' and a.episodeBeginDateTime     <= '20180828'

select (select [Note Count] from #note) as 'Note Count',
(select [Order Count] from #order) as 'Order Count',
sum((select [Order Count] from #order) + (select [Note Count] from #note))  as Total

Answer 1

删除sum()，除非你想聚合。此外，由于表中每个只包含一行，因此可以通过使用交叉连接来简化这一点。

SELECT n.[Note Count],
       o.[Order Count],
       n.[Note Count] + o.[Order Count] [Total]
       FROM #note n
            CROSS JOIN #order o;

Answer 2

虽然从临时表中选择单个列没有语法错误，但显而易见的是，您使用整个临时表来保存单个值，即总和。整数变量也可以保持计数。例如：

DECLARE @order int = 
( 
   select count (a.patientSID) 
     from CPRSOrder.CPRSOrder a
     join sstaff.SStaff b on b.staffSID = a.EnteredbyStaffSID 
     join spatient.spatient c on c.patientSID = a.patientSID
    where b.staffName = xxxxxxxx
      and a.enteredDateTime >= '20180801' and a.enteredDateTime <= '20180828'
)

DECLARE @note int = ( 
  select count (a.patientSID) 
    from tiu.tiudocument a
    join sstaff.SStaff b on b.staffSID = a.EnteredbyStaffSID 
  --join spatient.spatient c on c.patientSID = a.patientSID
   where b.staffName = xxxxxxxx
     and a.episodeBeginDateTime >= '20180801' and a.episodeBeginDateTime     <= '20180828'
)

SELECT @note AS [note count]
      ,@order AS [order count]
      ,@order + @note AS [total]