MDX - How to aggregate by date considering start and end date in a dimension

by Ricidleiv Tondatto   Last Updated July 03, 2017 20:06 PM

I need to calculate a measure grouping by date in a range of dates considering a start and end dates in a dimension. The objective is to count the number of students of a specific school that are actives on each day in a period.

The following SQL Code works on Data Warehouse (source of cube).

SELECT 
     t.[date]
    ,count(distinct A.SKStudent) as Students
FROM DM.DimTime t
    CROSS JOIN DM.FactStudents a 
    INNER JOIN DM.DimStudents m on a.SKStudent = m.SKStudent
    INNER JOIN DM.DimSchool e ON a.SKSchool = e.SKSchool
WHERE t.[date] between '20170502' and '20170512'
    and e.SchoolCode = 123456
    and t.[date] between m.[StartDate] and m.[EndtDate]
GROUP BY t.[data]

This is what I did. I don't know how filter using the logic in CASE statement (between '???' marks):

WITH SET DateRange AS 
    [Dim Time].[Date].&[20170502]:[Dim Time].[Date].&[20170512]
MEMBER StudentsByDay AS 
    AGGREGATE(DateRange, 
        ???CASE WHEN DateRange.CURRENTMEMBER 
                    BETWEEN [Dim Students].[Start Date] 
                        AND [Dim Students].[End Date] 
                THEN [Measures].[Students Count]
            ELSE NULL END???)
SELECT 
    NON EMPTY { [StudentsByDay] } ON COLUMNS,
    NON EMPTY { [DateRange] } ON ROWS
FROM [Education]
WHERE ( [Dim School].[School Code].&[123456] ) 


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