MDX - TopCount plus 'Other' or 'The Rest' by group (over a set of members)

Question

I\'ve got requirement to display top 5 customer sales by customer group, but with other customers sales within the group aggregated as \'Others\'. Something similar to this qu

Answer 1

The following is against AdvWrks and uses a technique I saw on Chris Webb's blog which he outlines here:
https://cwebbbi.wordpress.com/2007/06/25/advanced-ranking-and-dynamically-generated-named-sets-in-mdx/

The section of the script that creates the set MyMonthsWithEmployeesSets I find very difficult to get my head around - maybe @AlexPeshik could shed a little more light on what is happening in the following script.

WITH 
  SET MyMonths AS 
    TopPercent
    (
      [Date].[Calendar].[Month].MEMBERS
     ,20
     ,[Measures].[Reseller Sales Amount]
    ) 
  SET MyEmployees AS 
    [Employee].[Employee].[Employee].MEMBERS 
  SET MyMonthsWithEmployeesSets AS 
    Generate
    (
      MyMonths
     ,Union
      (
        {[Date].[Calendar].CurrentMember}
       ,StrToSet
        ("
             Intersect({}, 
             {TopCount(MyEmployees, 10, ([Measures].[Reseller Sales Amount],[Date].[Calendar].CurrentMember))
             as EmployeeSet"
            + 
              Cstr(MyMonths.CurrentOrdinal)
          + "})"
        )
      )
    ) 
  MEMBER [Employee].[Employee].[RestOfEmployees] AS 
    Aggregate
    (
      Except
      (
        MyEmployees
       ,StrToSet
        (
          "EmployeeSet" + Cstr(Rank([Date].[Calendar].CurrentMember,MyMonths))
        )
      )
    ) 
  MEMBER [Measures].[EmployeeRank] AS 
    Rank
    (
      [Employee].[Employee].CurrentMember
     ,StrToSet
      (
        "EmployeeSet" + Cstr(Rank([Date].[Calendar].CurrentMember,MyMonths))
      )
    ) 
SELECT 
  {
    [Measures].[EmployeeRank]
   ,[Measures].[Reseller Sales Amount]
  } ON 0
 ,Generate
  (
    Hierarchize(MyMonthsWithEmployeesSets)
   ,
      [Date].[Calendar].CurrentMember
    * 
      {
        Order
        (
          Filter
          (
            MyEmployees
           ,
            [Measures].[EmployeeRank] > 0
          )
         ,[Measures].[Reseller Sales Amount]
         ,BDESC
        )
       ,[Employee].[Employee].[RestOfEmployees]
      }
  ) ON 1
FROM [Adventure Works];

---

Edit - solution for Alex's third attempt:

WITH 
  SET [AllCountries] AS [Country].[Country].MEMBERS 
  SET [AllStates]    AS [State-Province].[State-Province].MEMBERS 
  SET [Top2States] AS 
    Generate
    (
      [AllCountries]
     ,TopCount
      (
        (EXISTING 
          [AllStates])
       ,3
       ,[Measures].[Internet Order Count]
      )
    ) 
  MEMBER [State-Province].[All].[RestOfCountry] AS 
    Aggregate({(EXISTING {[AllStates]} - [Top2States])}) 
SELECT 
  {[Measures].[Internet Order Count]} ON COLUMNS
 ,{
      [AllCountries]
    * 
      {
        [Top2States]
       ,[State-Province].[All].[RestOfCountry]
       ,[State-Province].[All]
      }
  } ON ROWS
FROM [Adventure Works];