如何使用SUM和LOOKUP函数

Question

在我的SSRS报告中，我有两个表：损失（表2）和赢得的保费（表1），两者都来自不同的数据集。我需要根据每个月和每年的损失和获得的保费计算比率。为此，我使用了LOOKUP功能，它工作正常：

SUM(Fields!PaidLosses.Value) / Lookup(Fields!AccidentYearNum.Value & Fields!AccidentMonthNum.Value, Fields!YearStartRisk.Value & Fields!MonthStartRisk.Value, Fields!EarnedPremium.Value, "EarnedAllCoverages")

但现在我需要计算TOTALS。这是每个月和每年的总损失除以每个月和每年的总保费。 基于这篇文章

http://www.sqlservercentral.com/blogs/salvoz-sql/2013/05/27/sum-result-of-ssrs-lookupset-function/

我插入了这个客户代码：

Function SumLookup(ByVal items As Object()) As Decimal
If items Is Nothing Then
Return Nothing
End If
Dim suma As Decimal = New Decimal()
Dim ct as Integer = New Integer()
suma = 0
ct = 0
For Each item As Object In items
suma += Convert.ToDecimal(item)
ct += 1
Next
If (ct = 0) Then return 0 else return suma 
End Function

现在我正在使用这个表达式：

=SUM(Fields!PaidLosses.Value) / Code.SumLookup(LookupSet(Fields!AccidentYearNum.Value & Fields!AccidentMonthNum.Value, Fields!YearStartRisk.Value & Fields!MonthStartRisk.Value, Fields!EarnedPremium.Value, "EarnedAllCoverages"))

但由于某些原因，这并没有给我正确答案。 我在这里缺少什么？

Answer 1

Answer: The expression for the total in the 3rd matrix needs some adjustment.

=SUM(Fields!PaidLosses.Value) / Code.SumLookup(LookupSet(Fields!AccidentYearNum.Value, Fields!YearStartRisk.Value, Fields!EarnedPremium.Value, "EarnedAllCoverages"))

The total is rolling up to the year, so the months are no longer needed.