Question

我有两个数据库字段（SQL Server），这些字段是十进制的。在SQL查询中，这两个字段均为0，我需要取这些值的百分比。在此记录中显示数据库错误。但是，如果发生这种情况，我需要显示0值。

有一个方案TotalSalesPrice = 0.00＆CurrNewsPrice = 0     那么Avgnews公式就是AvgNews =（CurrNewsPrice / TotalSalesPrice）* 100

Select  TotalSalesPrice,CurrNewsPrice,CAST(CurrNewsPrice AS decimal(18,2)) / CAST(TotalSalesPrice AS decimal(18,2)) * 100.00 AS AvgNews
from [dbo].[N_NewsLine]

Answer 1

特殊情况吗？

select  TotalSalesPrice,CurrNewsPrice, case
    when TotalSalesPrice = 0 and CurrNewsPrice = 0 then 0
    else CAST(CurrNewsPrice AS decimal(18,2)) /
          CAST(TotalSalesPrice AS decimal(18,2)) * 100.00
    end AS AvgNews
from [dbo].[N_NewsLine]

Answer 2

在分母上使用NULLIF()。然后ISNULL()计算结果

Select TotalSalesPrice,
       CurrNewsPrice,
       ISNULL(CAST(CurrNewsPrice AS decimal(18,2)) 
            / CAST(NULLIF(TotalSalesPrice, 0) AS decimal(18,2)) * 100.00, 0) AS AvgNews
from [dbo].[N_NewsLine]

Answer 3

您可以在使用这些值之前先进行检查。

Select  TotalSalesPrice,CurrNewsPrice,IIF(TotalSalesPrice = 0, 
                                            0,
                                            CAST(CurrNewsPrice AS decimal(18,2)) / CAST(TotalSalesPrice AS decimal(18,2)) * 100.00)  AS AvgNews
from [dbo].[N_NewsLine]

Answer 4

用例...在计算之前..

Select  TotalSalesPrice,CurrNewsPrice,
CAST( Case CAST(TotalSalesPrice AS decimal(18,2))
when 0 then 0.00
else CAST(CurrNewsPrice AS decimal(18,2)) / CAST(TotalSalesPrice AS decimal(18,2)) * 100.00 end AS decimal(18,2)) AS AvgNews
from [dbo].[N_NewsLine]

Answer 5

选择TotalSalesPrice，CurrNewsPrice，CAST（CurrNewsPrice AS十进制（18,2））/ CAST（NULLIF（TotalSalesPrice，0）AS十进制（18,2））* 100.00 AS平均新闻来自[dbo]。[N_NewsLine]

Answer 6

如果您希望结果为decimal(18, 2)，则在除法之后进行cast() 。除以小数点后，结果类型的规则为。。。而不是拜占庭（拜占庭人无罪）。

我建议NULLIF()避免被零除，导致：

Select TotalSalesPrice, CurrNewsPrice,
       cast(CurrNewsPrice * 100.00 /
            nullif(TotalSalesPrice, 0) as decimal(18, 2)
           ) as AvgNews
from [dbo].[N_NewsLine]

将平均值除以零时将平均值取为0

6 个答案: