多部分标识符“IncomeExpenses.OperationId”无法绑定

Question

我有一个具有以下字段的表：

OperationID, 
Date, 
TotalExpenses, 
TotalIncome 

我使用下面的SQL查询来获取基于TotalExpenses和TotalIncome之间的区别指定OperationID：

select 
    (select (Date) from IncomeExpenses) 
,(select (totalincome) from IncomeExpenses) 
-(select (totalexpenses) from IncomeExpenses) 
where IncomeExpenses.OperationId ='1' 

但是我得到这个错误：

The multi-part identifier "IncomeExpenses.OperationId" could not be bound

我可能会做错什么？

Answer 1

如果这是SQL查询应该看起来像：

select Date, (totalincome - totalexpenses) as differencetotal 
from IncomeExpenses where OperationId ='1' 

Answer 2

为你写的子查询选择单独列的一些原因。外部查询中没有FROM子句，因此您不能编写引用任何表的where子句。为什么你不只是写作

select date, 
     totalincome-totalexpenses 
from IncomeExpenses 
where OperationId=1