Question

如何解决被零除的问题？

我正在尝试计算利润百分比，但除以零误差。我是新来的，几乎所有论坛都尝试过，但是找不到任何解决方案。我正在使用SQL Server。

请帮助我，我在哪里犯错？

SELECT
    SO_VInv.AccountNo, SUM(SO_VInv.LineCost) AS "Cost Price", 
    COUNT(SO_VInv.QuantityThisDel) AS Quantity, COUNT(SO_VInv.InvoiceNo) AS "Number of Invoices", 
    SUM(SO_VInv.CurrentLineTotal) AS "Sale Price", SUM(SO_VInv.CurrentLineTotal) -  SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge) AS "Gross Profit",
    SUM(SO_VInv.CurrentLineTotal) - SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge) / (SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge)
FROM 
    SO_VInv
WHERE
    InvDate >= '2019-01-01'
GROUP BY
    SO_VInv.AccountNo

以上行都工作正常，但是这部分引起了问题

    SUM(SO_VInv.CurrentLineTotal) - SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge) / (SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge)
FROM 
    SO_VInv
WHERE
    InvDate >= '2019-01-01'
GROUP BY
    SO_VInv.AccountNo

我试图解决这样的问题，但仍然出现错误

DECLARE @SalePrice DECIMAL
DECLARE @Tax DECIMAL
DECLARE @CostPrice DECIMAL
DECLARE @Profit DECIMAL
DECLARE @Quantity DECIMAL
DECLARE @Final DECIMAL

SET @SalePrice = (SELECT(SUM(SO_VInv.CurrentLineTotal)) FROM SO_VInv )
SET @Tax = (SELECT(SUM(SO_VInv.TaxToCharge)) FROM SO_VInv )
SET @CostPrice = (SELECT(SUM(SO_VInv.LineCost)) FROM SO_VInv )
SET @Profit = (SELECT(@SalePrice-@Tax) FROM SO_VInv )
SET @Quantity = (SELECT COUNT(SO_VInv.QuantityThisDel)FROM SO_VInv )
SET @Final = (SELECT @SalePrice AS "SalePrice"
              FROM SO_VInv
              WHERE InvDate >= '2019-01-01'
              GROUP BY SO_VInv.AccountNo)

SELECT @Final

除以零误差

我尝试了很多在线解决方案，包括声明和设置变量等方法。

Answer 1

使用nullif()：

select x / nullif(y, 0)

这将返回null而不是生成错误。

对于您的特定声明：

SUM(SO_VInv.CurrentLineTotal) - SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge) / NULLIF(SUM(SO_VInv.LineCost) - SUM(SO_VInv.TaxToCharge), 0)

Answer 2

您可以使用case语句，例如case的值等于零，然后为0，否则计算结束

在SQL Server中被0除

2 个答案: