SQL服务器关联查询要取和

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

试试这个：

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

SQL服务器关联查询要取和

SQL Server correlated query want to take sum

sql

sql-server

subquery