如何在sql Select子句中添加2個數字？

Question

我有這個疑問：

Select 
    Count(DocumentID) 
From 
    Documents d 
Inner Join 
    Accounts a on a.AccountID = d.CreatedByAccountID 
Where 
    a.FeeExempt = 1 
    Or 
    (Select 
     Case 
      When a.OrganizationTypeID = 1 Or a.OrganizationTypeID = 2 
      Then 0 
      Else EFileFee 
     End 
    From ITypes 
    Where ITypeID = d.ITypeID 

    + 
    Select 100 --just to test 
    ) <= 0 

我怎樣才能讓這個查詢編譯？基本上我想要做2個選擇並檢查兩者的添加是否小於0。但顯然此時查詢不正確，無法編譯。

Answer 1

你想這樣的：

. . .. 
(select sum(val) 
from ((Select (Case When a.OrganizationTypeID = 1 Or a.OrganizationTypeID = 2 Then 0 Else EFileFee End) as val 
     From ITypes 
     Where ITypeID = d.ITypeID 
     ) union all 
     (Select 100 --just to test 
     ) 
    ) t 
) <= 0