sql-server - SQL Server 上的“无法对聚合或子查询执行聚合函数”错误

Question

Select A.nEvrakKalemID As ID, 
  A.cEvrakKalem As [Inventory Name],
  SUM((IsNull((Select SUM(B.nMiktar) Where B.nEvrakTip = 3 or B.nEvrakTip = 7),0)) - (IsNull((Select SUM(B.nMiktar) Where B.nEvrakTip = 4 or B.nEvrakTip = 8),0))) As Inventory
From MasrafAnaliz.dbo.EvrakKalem A 
Left Outer Join MasrafAnaliz.dbo.EvrakKalemHareket B
On B.nKodEvrakKalem = A.nEvrakKalemID
Group By A.nEvrakKalemID, A.cEvrakKalem, B.nMiktar
Order By A.nEvrakKalemID

在上面的问题中，我想总结Inventory列，并根据nEvrakKalemID列对其进行分组。但它不起作用。预先感谢您的帮助。

Answer 1

试试这个:

Select A.nEvrakKalemID As ID, 
       A.cEvrakKalem As [Inventory Name],
       (SUM(CASE  WHEN B.nEvrakTip = 3 or B.nEvrakTip = 7 
                  THEN (IsNull(B.nMiktar,0))
                  ELSE 0
            END) -
        SUM(CASE WHEN B.nEvrakTip = 4 or B.nEvrakTip = 8
                 THEN IsNull(B.nMiktar,0)
                 ELSE 0
            END)) As Inventory
From MasrafAnaliz.dbo.EvrakKalem A 
Left Outer Join MasrafAnaliz.dbo.EvrakKalemHareket B On B.nKodEvrakKalem = A.nEvrakKalemID
Group By A.nEvrakKalemID, A.cEvrakKalem, B.nMiktar
Order By A.nEvrakKalemID