Question

我正在尝试编写一条SQL语句，表明正在给出什么样的佣金。我坚持最后一部分，显示了给出的百分比，因为SQL不会将char值转换为money。我是新手，所以我的转换尝试可能完全是假的。

CASE 
   WHEN VehicleSales.CommissionSP1 ='500' then 'Flat'
   WHEN VehicleSales.CommissionSP1 = '0' then 'Not Applicable'
      else Convert(int, VehicleSales.CommissionSP1) / Convert (int, VehicleSales.GrossProfit)
END AS Commission_Type

Answer 1

我会在分母中抛出一个浮点数并输入逻辑以防止被零除：

CASE 
   WHEN VehicleSales.CommissionSP1 ='500' then 'Flat'
   WHEN VehicleSales.CommissionSP1 = '0' then 'Not Applicable'
      else cast(VehicleSales.CommissionSP1 as int)/ case when cast(VehicleSales.GrossProfit as float)=0 then 1 else cast(VehicleSales.GrossProfit as float) end
END AS Commission_Type

Answer 2

此处case表达式存在两个问题：

您可能会被零错误划分。
您正尝试在同一case表达式中返回多种数据类型。

如果您绝对需要返回Flat，Not Applicable或百分比，则需要将该百分比作为nvarchar / varchar字符串返回：

case VehicleSales.CommissionSP1
   when '500' then 'Flat'
   when '0' then 'Not Applicable'
   else convert(nvarchar(20),isnull(convert(int,VehicleSales.CommissionSP1)
                                    / nullif(convert(decimal(10,2),VehicleSales.GrossProfit),0)
                                   ,0)
               )
   end as Commission_Type

我建议您不要在同一列中返回Flat和Not Applicable值作为百分比。就个人而言，我会选择一个包含佣金类型的列，另一个包含相关值的列。这样，您可以在佣金类型组中进行汇总，而无需一直担心convert您的数据：

select case VehicleSales.CommissionSP1
         when '500' then 'Flat'
         when '0' then 'Not Applicable'
         else 'Percentage'
         end as Commission_Type
      ,case VehicleSales.CommissionSP1
         when '500' then 500    -- I am assuming you actually have some way of knowing what is flat beyond hard coding values here.
         when '0' then 0
         else isnull(convert(int,VehicleSales.CommissionSP1)
                                 / nullif(convert(decimal(10,2),VehicleSales.GrossProfit),0)
                                ,0)
         end as Commission

Answer 3

它会将varchar转换为smallmoney。学会打破这个问题。

列（甚至是大小写）只能是一种数据类型。

这不会保护varchar中的数字或利润除以零。

declare @T table (com varchar(10), profit varchar(10));
insert into @T values ('0', '1000'), ('500', '1000'), ('12', '1000'), ('100', '1000');
select t.*, cast(com as smallmoney) comM, CAST(profit as smallmoney) as profitM 
     , case com when '0'   then 'Flat'
                when '500' then 'Not Applicable'
                else            cast(cast(com as smallmoney) / 
                                     CAST(profit as smallmoney) as varchar(100))
       end as smart
from @T t

SQL数据转换＆amp;除法

3 个答案: