加入Alias和凡在SQL

Question

我想運行一個查詢，在那裏我可以用where子句

在一個別名例如：

Select V.Fees - Coalesce(V.Payment,0) - Coalesce (V.Adjustment,0) AS Balance 
[ 
the inner join query for the tables 
] 
Where A.Order not Null and Balance = 0 
Order by Name 

但像往常一樣是不能夠識別欠平衡哪裏？

我們該如何解決這個問題？

Answer 1

做你要求的唯一方法就是把這個字段放在CTE中，並通過CTE的加入來引用它。

Answer 2

可以重複表達在where子句中

Select V.Fees - Coalesce(V.Payment,0) - Coalesce (V.Adjustment,0) AS Balance 
[ 
the inner join query for the tables 
] 
Where A.Order not Null and (V.Fees - Coalesce(V.Payment,0) - Coalesce (V.Adjustment,0)) = 0 
Order by Name