MDX 计算量度总和

Question

我为 SSRS 报告开发了一个 MDX 查询，该报告有一个名为 CurrentMonthAndAllOfLastYear 的计算度量，它应该将当月的净销售额与上一年的净销售额相加。不幸的是，计算出的衡量标准似乎一直在总结每笔净销售额。 MDX 是：

WITH 
SET [CurrMonth] AS [Sales Period].[Sales Period].CurrentMember --Month
SET [CurrYear] AS ANCESTORS([CurrMonth](0), 2)   --Year
SET [PriorYear] AS [CurrYear](0).LAG(1)   -- Gets prior Year

MEMBER [Measures].[CurrentMonthAndAllOfLastYearAmt] AS SUM({[CurrMonth], [PriorYear]}, Measures].[Net Sales])
MEMBER [Measures].[Debtors Collection Days] AS ([Measures].[Total Owing Amount] * 90) / [Measures].[CurrentMonthAndAllOfLastYearAmt]

SELECT  
{
[Measures].[CurrentMonthAndAllOfLastYearAmt],
[Measures].[Total Owing Amount],
[Measures].[Debtors Collection Days],
[Measures].[Net Sales] } ON COLUMNS,
{
[Sales Period].[Sales Month].[Sales Month].ALLMEMBERS } ON ROWS 
FROM ( SELECT ( YTD(STRTOMEMBER('[Sales Period].[Sales Period].[Sales Month].&[2013-05-31T00:00:00]')) ) ON COLUMNS 
FROM ( SELECT ( STRTOSET('[Sales Representative Mirror].[Sales Representative ID].&[261]') ) ON COLUMNS 
FROM [Sales])) 

MDX sn-p 生成以下内容：

Sales Month CurrentMonthAndAllOfLastYearAmt 
31/01/2013  $320,429.60 ... 
28/02/2013  $320,429.60 ... 
31/03/2013  $320,429.60 ... 
30/04/2013  $320,429.60 ... 
31/05/2013  $320,429.60 ... 

我需要以下输出（2012 年没有任何销售）：

Sales Month  CurrentMonthAndAllOfLastYearAmt
31/01/2013  $0.00 ...
28/02/2013  $0.00 ...
31/03/2013  $0.00 ...
30/04/2013  $18,931.10 ...
31/05/2013  $22,557.22 ...

任何帮助将不胜感激。

Answer 1

我不会使用集合来执行此操作，而是使用ParallelPeriod MDX 函数。

MEMBER [Measures].[CurrentMonthAndAllOfLastYearAmt] AS 
   ([Sales Period].[Sales Period].CurrentMember,[Measures].[Net Sales]) 
   + 
   ( ParallelPeriod( [CurrMonth](0), 1, [Sales Period].[Sales Period].CurrentMember), [Measures].[Net Sales] )

很好的问题是每次使用或每次 MDX 请求时都会评估该集合。之后你就有了上下文（使用或不使用 where 和子查询上下文）。