Sql server SQL中两个临时列之间的百分比差异

我正在尝试为此查询添加一列，该列将计算c.PopulationForecast和c.PopulationActualMAX和/或c.PopulationActualMin之间的百分比差异。如果只有一个专栏就好了，但我会选择两个

SELECT c.DepartmentName, c.DateandTime, c.ExecutionDate, c.PopulationForecast, c.PopulationActualMAX, c.PopulationActualMIN 
FROM 
    (SELECT DepartmentName, DateandTime, ExecutionDate FROM ForecastTable WHERE DateandTime >= CAST(GETDATE() AS DATE)) d
CROSS APPLY
    (SELECT *,
        (SELECT MAX(ACT.PopulationActual) FROM ActualsTable ACT JOIN DepartmentTable DTD ON DTD.DepartmentTypeID = ACT.DepartmentTypeId JOIN FacilityTable FD ON FD.FacilityID = ACT.FacilityID WHERE (ACT.TargetDateTime >= DATEADD(DAY, -28, d.DateandTime)) and (DATEPART(WEEKDAY, ACT.TargetDateTime) = DATEPART(WEEKDAY, d.DateandTime)) and (CONCAT(FD.FacilityKey,'.All',DTD.DepartmentTypeKey) = DepartmentName))
        as PopulationActualMAX,
        (SELECT MIN(ACT.PopulationActual) FROM ActualsTable ACT JOIN DepartmentTable DTD ON DTD.DepartmentTypeID = ACT.DepartmentTypeId JOIN FacilityTable FD ON FD.FacilityID = ACT.FacilityID WHERE (ACT.TargetDateTime >= DATEADD(DAY, -28, d.DateandTime)) and (DATEPART(WEEKDAY, ACT.TargetDateTime) = DATEPART(WEEKDAY, d.DateandTime)) and (CONCAT(FD.FacilityKey,'.All',DTD.DepartmentTypeKey) = DepartmentName))
        as PopulationActualMIN      
     FROM ForecastTable
     WHERE 
        DepartmentName = d.DepartmentName
        and DateandTime = d.DateandTime
        and (
            (ROUND (PopulationForecast, 0) > 
                (
                SELECT MAX(ACT.PopulationActual) 
                FROM ActualsTable ACT 
                JOIN DepartmentTable DTD ON DTD.DepartmentTypeID = ACT.DepartmentTypeId 
                JOIN FacilityTable FD ON FD.FacilityID = ACT.FacilityID 
                WHERE (ACT.TargetDateTime >= DATEADD(DAY, -28, d.DateandTime)) 
                and (DATEPART(WEEKDAY, ACT.TargetDateTime) = DATEPART(WEEKDAY, d.DateandTime)) 
                and (CONCAT(FD.FacilityKey,'.All',DTD.DepartmentTypeKey) = d.DepartmentName)
                )
            ) 
            or 
            (ROUND (PopulationForecast, 0) < 
                (
                SELECT MIN(ACT.PopulationActual) 
                FROM ActualsTable ACT 
                JOIN DepartmentTable DTD ON DTD.DepartmentTypeID = ACT.DepartmentTypeId 
                JOIN FacilityTable FD ON FD.FacilityID = ACT.FacilityID 
                WHERE (ACT.TargetDateTime >= DATEADD(DAY, -28, d.DateandTime))
                and (DATEPART(WEEKDAY, ACT.TargetDateTime) = DATEPART(WEEKDAY, d.DateandTime))
                and (CONCAT(FD.FacilityKey,'.All',DTD.DepartmentTypeKey) = d.DepartmentName)
                )
            )
            )
        ) c
    Order By d.DepartmentName, d.DateandTime

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有什么东西阻止你把差异放在第一行吗

例如：

(c.PopulationForecast-c.PopulationActualMIN)/c.PopulationForecast ForecastVsMin
, (c.PopulationForecast-c.PopulationActualMAX)/c.PopulationForecast ForecastVsMax

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从您的查询中，您似乎已经找到了所有要查找的三个字段。

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