Question

我的查询

SELECT  DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) AS TotalDays ,amount 
FROM staydetails

例如，金额列的值可能为100，我需要将totaldays和amount的值相乘，然后将结果添加到另一列。

Answer 1

只需将计算列添加到选择列表中，如下所示：

 select  
 DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) AS TotalDays ,
 amount,
 (DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) * amount) AS CalculatedAmount
from staydetails

请注意，您需要重复DATEDIFF功能 - 您不能使用别名TotalDays。

Answer 2

非常直接：

select  DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) AS TotalDays ,amount,
        (DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) * amount) as Result 
from staydetails

Answer 3

只需将它们相乘：

select  DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) AS TotalDays ,
        amount ,
        DATEDIFF(day,SD.STARTDATE,SD.ENDDATE) * amount AS CalculatedValue
from staydetails

您可能尝试过这样引用TotalDays：TotalDays * amount，但您必须对基础值执行计算，这是DATEDIFF计算的结果，而不是别名列名。

将sql中两列之间的值相乘

3 个答案: