SQL - 其他計數的百分比

Question

我試圖通過第二計數來獲得第一計數的百分比。換句話說，我想要做的NbFirstCallResolutions/TotalCases * 100

SELECT 

(SELECT 
COUNT([Incident].IncidentId) 
FROM [Incident],[CaseResolution] 
WHERE [Incident].IncidentId = [CaseResolution].RegardingObjectId 
AND [CaseResolution].FirstCallResolution = 1 
AND [Incident].CreatedOn >= @Parameter_StartDate 
AND [Incident].CreatedOn <= DATEADD(day,1,@Parameter_EndDate) 
) AS NbFirstCallResolutions, 

(SELECT 
COUNT([Incident].IncidentId) 
FROM [Incident] 
WHERE [Incident].CreatedOn >= @Parameter_StartDate 
AND [Incident].CreatedOn <= DATEADD(day,1,@Parameter_EndDate) 
) AS TotalCases 

--SELECT NbFirstCallResolutions/TotalCases * 100.0 

不知道如何處理這一個...

Answer 1

您的查詢應該能夠得到鞏固這樣的：

SELECT 
    SUM(coalesce([CaseResolution].FirstCallResolution, 0)/
    COUNT([Incident].IncidentId) * 100 
FROM 
    [Incident] 
    left join [CaseResolution] on 
      [Incident].IncidentId = [CaseResolution].RegardingObjectId 
      AND [CaseResolution].FirstCallResolution = 1 
WHERE 
    [Incident].CreatedOn >= @Parameter_StartDate 
    AND [Incident].CreatedOn <= DATEADD(day,1,@Parameter_EndDate 

請注意，我總結了1的值FirstCallResolution，空值爲0.這相當於對行進行計數。

一定要檢查您的操作順序，因爲我相信乘法會先發生，然後是除法。