如何在SQLServerManagementStudio中使用平均列编写查询

我想知道我是否可以在这个脚本中添加一个average列，它根据天数平均检查的总数。目前，该报告显示了5天的检查时间。因此我需要

averageinspection

列将

totalinspection

除以5。这可能吗

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

我想展示一下：

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

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当DATEDIFF寻找“1”时，5从何而来？谢谢，看起来是这样，如果我改变日期范围，平均值也会改变吗？@Tyrone2011:是的。只要除数与WHERE过滤器的DATEDIFF相同

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