TSQL除以零誤差

Question

我有一個查詢正在做一些數學計算，有些時候數字可能是一個零，它的分割將導致一個錯誤。

我在這個網站上發現了一些關於如何解決它的問題，但現在這個數字根本不會改變。

Example Data: 
los.shortTermLosses = 1 
A.shortTerm = 15 
Giving the equation of 1/15*12 = 0.8 

COALESCE(los.shortTermLosses/NULLIF(A.shortTerm,0),0.00)* 12 AS shortTermAttrition 

它必須是我做的事情，以防止除以零錯誤，但不知道如何讓它正常工作。目前的結果總是0.00

更新

對於那些誰希望看到整個查詢..

SELECT A.QID, 
      (SELECT TOP 1 E.[FirstName], 
          E.[LastName], 
          E.[NTID], 
          E.[TitleDesc], 
          A.[countOfDirects], 
          A.[longTerm], 
          A.[shortTerm], 
          COALESCE(los.totalLosses,0) totalLosses, 
          COALESCE(los.longTermLosses, 0) longTermLosses, 
          COALESCE(los.shortTermLosses,0) shortTermLosses, 
          COALESCE(los.shortTermLosses/NULLIF(A.shortTerm,0),0.00)* 12 AS shortTermAttrition, 
          COALESCE(los.longTermLosses/NULLIF(A.longTerm,0),0.00)* 12 AS longTermAttrition, 
          COALESCE(los.totalLosses/NULLIF(A.countOfDirects,0),0.00)* 12 AS totalAttrition 
      FROM  employeeTable_historical AS E 
      OUTER APPLY (SELECT   COUNT(b.leaver) as [totalLosses], 
             sum(case when b.term = 'LTA' then 1 else 0 end) as [longTermLosses], 
             sum(case when b.term = 'STA' then 1 else 0 end) as [shortTermLosses] 
           FROM dbo.attritionData AS B 
           WHERE E.QID = B.supervisor 
           AND MONTH(B.leaveDate) = @month 
           AND YEAR(B.leaveDate) = @year 
           GROUP BY b.supervisor 
      )los 
      WHERE E.qid = A.[QID] 
        AND CONVERT (DATE, dateadd(mm, (@year - 1900) * 12 + @month - 1 , @day - 1)) >= CONVERT (DATE, E.[Meta_LogDate]) 
      ORDER BY meta_logDate DESC 
      FOR  XML PATH (''), TYPE, ELEMENTS) 
    FROM (SELECT QID, 
        [timestamp], 
        [countOfDirects], 
        [longTerm], 
        [shortTerm] 
      FROM (SELECT QID, 
          [timestamp], 
          [countOfDirects], 
          [shortTerm], 
          [longTerm], 
          ROW_NUMBER() OVER (PARTITION BY QID ORDER BY [Timestamp]) AS Row 
        FROM [red].[dbo].[attritionCounts] 
        WHERE [mgrQID] = @director 
          AND YEAR(CAST ([timestamp] AS DATE)) = @year 
          AND MONTH(CAST ([timestamp] AS DATE)) = @month) AS Tmp1 
      WHERE Row = 1) AS A 
    FOR XML PATH ('DirectReport'), TYPE, ELEMENTS, ROOT ('Root'); 

Answer 1

你的錯誤並不來自NULLIF，你只是一個分整數例如1月15日= 0
，只是改變你的任期到：
COALESCE(CAST(los.shortTermLosses as float)/NULLIF(A.shortTerm,0),0.00)* 12 AS shortTermAttrition

最接近轉型爲你的XML導出可能

Declare @shortTermLosses int = 1 
Declare @shortTerm int = 15 

select 
CAST(
COALESCE(CAST(@shortTermLosses AS float)/Cast(NULLIF(@shortTerm,0) AS float),0.00)* 12 
as Money) 
AS shortTermAttrition 
FOR  XML PATH (''), TYPE, ELEMENTS