SQL - 其他计数的百分比

Question

我试图通过第二计数来获得第一计数的百分比。换句话说，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 

不知道如何处理这一个...

Answer 1

您的查询应该能够得到巩固这样的：

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 

请注意，我总结了1的值FirstCallResolution，空值为0.这相当于对行进行计数。

一定要检查您的操作顺序，因为我相信乘法会先发生，然后是除法。