Question

我正在使用SQL Server 2014，并且我有以下查询给出了一个特定的错误消息：“无法对包含聚合或子查询的表达式执行聚合函数”。

 USE MyDatabase
 SELECT [MTH], 
        [RoomTypeCode], 
        SUM ([RN] * [AdultCount] / SUM ([RN])) AS    'Weighted Adult Ratio',
        SUM ([RN] * [ChildCount] / SUM ([RN])) AS 'Weighted Child Ratio'


 FROM PaxRatio

 WHERE [PropertyCode] = 'XYZ'

 AND [MTH] between '2015-07-01' and '2016-09-30'

查询的目的是为我提供视图表中的AdultCount和ChildCount列的加权平均值（称为PaxRatio）。

我尝试过使用CTE表而不是VIEW表，但我仍然遇到同样的错误！

Answer 1

我认为你只需改变括号的位置：

 SELECT [MTH], 
        [RoomTypeCode], 
        SUM ([RN] * [AdultCount]) / SUM ([RN]) AS 'Weighted Adult Ratio',
        SUM ([RN] * [ChildCount]) / SUM ([RN]) AS 'Weighted Child Ratio'
 FROM PaxRatio
 WHERE [PropertyCode] = 'XYZ'
 AND [MTH] between '2015-07-01' and '2016-09-30'

Answer 2

您无法在另一个SUM功能中执行SUM。您可以在单独的查询中计算SUM并使用CROSS JOIN以便在主查询中使用计算值：

 SELECT [MTH], 
        [RoomTypeCode], 
        SUM ([RN] * [AdultCount] / sum_rn) AS 'Weighted Adult Ratio',
        SUM ([RN] * [ChildCount] / sum_rn) AS 'Weighted Child Ratio'
 FROM PaxRatio
 CROSS JOIN (
    SELECT SUM([RN]) AS sum_rn
    FROM PaxRatio
    WHERE [PropertyCode] = 'XYZ' AND 
          [MTH] BETWEEN '2015-07-01' AND '2016-09-30') t
 WHERE [PropertyCode] = 'XYZ' AND 
       [MTH] between '2015-07-01' and '2016-09-30'

如何重写我的T-SQL查询以消除“表达式上的聚合函数”错误？

2 个答案: