Question

表中的两列是INT，SA.SalesQuantity和SA.RefundQuantity

我想使用案例陈述计算2107和2016之间的差异，如下所示：

(SUM(CASE WHEN SA.FISCALYEAR = 2017 AND SA.FISCALWEEK = 22 
THEN SA.SalesQuantity-SA.RefundQuantity END ) 
/ SUM(CASE WHEN SA.FISCALYEAR = 2016 AND SA.FISCALWEEK = 22 
THEN SA.SalesQuantity-SA.RefundQuantity END ))-1 
AS 'SaleQTY_Var'

如何将结果作为小数而不是INT返回？

Answer 1

Int/Int = Int因此将 numerator 或分母更改为Decimal值以获得带小数值的结果。我将分子乘以1.0将其转换为十进制

(SUM(CASE WHEN SA.FISCALYEAR = 2017 AND SA.FISCALWEEK = 22 
THEN SA.SalesQuantity-SA.RefundQuantity * 1.0 END ) 
/ 
SUM(CASE WHEN SA.FISCALYEAR = 2016 AND SA.FISCALWEEK = 22 
THEN SA.SalesQuantity-SA.RefundQuantity END ))-1 
AS 'SaleQTY_Var'

Answer 2

只需在计算后转换值：

CONVERT(DECIMAL(18, 4) (SUM(CASE WHEN SA.FISCALYEAR = 2017 AND SA.FISCALWEEK = 22 THEN SA.SalesQuantity - SA.RefundQuantity END )*1.0 / SUM(CASE WHEN SA.FISCALYEAR = 2016 AND SA.FISCALWEEK = 22 THEN SA.SalesQuantity - SA.RefundQuantity END )) - 1 ) AS SaleQTY_Var

Answer 3

另一种使用CAST方法将一个操作数转换为十进制类型

的方法

CAST(
    (SUM(CASE WHEN SA.FISCALYEAR = 2017 AND SA.FISCALWEEK = 22 
         THEN SA.SalesQuantity-SA.RefundQuantityEND) AS DECIMAL) 
/ 
SUM(CASE WHEN SA.FISCALYEAR = 2016 AND SA.FISCALWEEK = 22 
    THEN SA.SalesQuantity-SA.RefundQuantity END )) - 1 
AS 'SaleQTY_Var'

将整数转换为十进制

3 个答案: