在包含聚合的表达式上执行聚合函数

Question

Fundid fundtype合同 1Credit0.100.152Credit0.200.253Credit0.300.354Credit0.400.455Credit0.500.556equity0.600.657equity0.700.758equity0.800.859Cash0.900.9510Cash0.991.55WeightedPerformance = SUM ( (Allocation/SUM(Allocation Per FundType) * Performance) 信用示例：

	绩效
			我想根据以下公式来得出每种基金类型的加权性能：

Sum of Allocation =  1.50 (0.10+0.20+0.30+0.40+0.50)

WeightedPerformance = Sum(((0.1/1.5)*0.15) + ((0.2/1.5)*0.25) + ((0.3/1.5)*0.35) + ((0.4/1.5)*0.45)+ ((0.5/1.5)*0.55) )

WeightedPerformance of Credit = 0.416666666666667

如何使用每个funcete的T-SQL对此进行计算？ 到目前为止，Query：

SELECT 
        FundType, 
        Sum((Allocation/Sum(Allocation))*Performance) as WeightedPerformance 
FROM
       FundAllocation
GROUP BY
       FundType

但是得到： Cannot在包含聚合或子查询的表达式上执行聚合函数。

注：这个问题不是

SQLServer的重复，“无法在包含聚合或子查询的表达式上执行汇总函数”，但是Sybase可以使用，因为建议的问题是使用子句分组的，以进行进一步汇总。在这种情况下，它由Fundtype分组。

您可以使用窗口函数为此

WITH summed AS (
    SELECT 
       fa.*,
       SUM(fa.Allocation) OVER (PARTITION BY fa.FundType) AS AllocationPerFundType
    FROM FundAllocation fa
)
SELECT
  fa.FundType,
  SUM(fa.Allocation / fa.AllocationPerFundType * fa.Performance) as WeightedPerformance,
  SUM(Allocation) AS SumAllocation
FROM summed fa
GROUP BY
  fa.FundType;