Question

select 
    SUM(Convert(int, (Select SUM(Convert(int, amount)) 
                       from ChargesType 
                       where ChargesType.ID = Charges.ChargesTypeID))) as Amount 
from Charges 
Where Charges.RollNo = 1

这是我的查询;我想获得金额列的总和。

Answer 1

请改为尝试：

select 
    SUM(t.Amount) as Amount 
from Charges AS c
INNER JOIN
(
   SELECT Convert(int, amount) AS Amount, ID
   FROM  ChargesType
) AS t ON t.ID = c.ChargesTypeID
Where c.RollNo = 1

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