如何在SQL Server Management Studio中使用平均列編寫查詢

Question

我想知道是否可以將平均列添加到此腳本中，從而將平均檢查總數除以天數。目前這份報告顯示了5天的檢查。所以我需要averageinspection列將totalinspection除以5.這是可能的嗎？

SELECT  
    EstimName_String AS Inspector, 
    InspectionProcedureName AS inspection, 
    COUNT(*) AS TotalInspections 
FROM 
    UnitData_Vehicle 
WHERE 
    DATEDIFF(day, InspectionDateTime, GETDATE()) = 1 
GROUP BY 
    InspectionProcedureName, EstimName_String 

我想顯示此：

Inspector Inspection Totalinspections Averageinspections 
Joe Bloggs Inspection   20    4 
Micky Mouse Inspection  100    20 
Jack and Jill Inspection  50    10 

Answer 1

SELECT 
    EstimName_String AS Inspector, 
    InspectionProcedureName AS inspection, 
    COUNT(*) AS TotalInspections, 
    COUNT(*)/DATEDIFF(day, InspectionDateTime, GETDATE()) AS AverageinspectionsPerDay 
FROM 
    UnitData_Vehicle 
WHERE 
    (DATEDIFF(day,  InspectionDateTime, GETDATE()) = 1) 
GROUP BY 
    InspectionProcedureName, EstimName_String