如何添加两个字段值并将它们插入单个列？

Question

我有一张桌子：

MTCN       Number        RecPrincipalAmount        TotalCharges
123        APK123            506.21                   258.22

现在我想添加RecPrincipalAmount和TotalCharges并将其插入PrincipalAmount。

我想要这个：

MTCN       Number        PrincipalAmount        
123        APK123            764.43

我想在Crystal Reports中显示所有这些数据。

Answer 1

select MTCN,
       Number,
       RecPrincipalAmount+TotalCharges as PrincipalAmount
from YourTable

您可以在添加之前将varchar转换为float。

select MTCN,
       Number,
       cast(RecPrincipalAmount as float)+cast(TotalCharges as float) as PrincipalAmount
from YourTable

或money如果更合适。

select MTCN,
       Number,
       cast(RecPrincipalAmount as money)+cast(TotalCharges as money) as PrincipalAmount
from YourTable

Answer 2

尝试使用它。

SELECT 
   MTCN,
   Number,
   CONVERT(FLOAT, RecPrincipalAmount) + CONVERT(FLOAT, TotalCharges) PrincipalAmount
FROM TableName

Answer 3

使用公式字段：

//{@Principal}
{table.RecPrincipalAmount} + {table.TotalCharges}

Answer 4

SELECT SUM(RecPrincipalAmount + TotalCharges ) as "You Column"
FROM Your_Table;