UNION multiple MDX queries in SSAS (powerpivot) - ssas

Question

I have some sort of difficulties trying to join 2 MDX queries together. When running them separately they work fine. The script below
WITH
MEMBER [Measures].[ParameterCaption] AS
[Main_Incidents].[Priority].CurrentMember.Member_Caption
MEMBER [Measures].[ParameterValue] AS
[Main_Incidents].[Priority].CurrentMember.UniqueName
MEMBER [Measures].[ParameterLevel] AS
[Main_Incidents].[Priority].CurrentMember.Level.Ordinal
SELECT
{
[Measures].[ParameterCaption]
,[Measures].[# Incidents]
,[Measures].[%SLA]
} ON COLUMNS
,[Main_Incidents].[Priority].ALLMEMBERS ON ROWS
FROM [Model];
WITH
MEMBER [Measures].[ParameterCaption] AS
[Main_Incidents].[usr_directorate].CurrentMember.Member_Caption
MEMBER [Measures].[ParameterValue] AS
[Main_Incidents].[usr_directorate].CurrentMember.UniqueName
MEMBER [Measures].[ParameterLevel] AS
[Main_Incidents].[usr_directorate].CurrentMember.Level.Ordinal
SELECT
{
[Measures].[ParameterCaption]
,[Measures].[# Incidents]
,[Measures].[%SLA]
} ON COLUMNS
,[Main_Incidents].[usr_directorate].ALLMEMBERS ON ROWS
FROM [Model];
The most important bit for me is that I need the label column to show. So I want to UNION the 2 queries together so that the ParameterCaption captures values from "Priority" dimension and "Directorate" dimension....
Please someone help me to achieve this?

Answer 1

This is a bit complex, but definitely possible.
Union in MDX only works for members of the same hierarchy, so to achieve this we need to make the row members into Tuples that combine the two hierarchies. We can do this by cross joining each of the ALLMEMBERS sets to the [All] member for the other hierarchy. Then we just need to change the Parameter Caption, Value and Level to conditionally get the value from the appropriate hierarchy.
This could look something like the code below:
WITH
MEMBER [Measures].[ParameterCaption] AS
IIF([Main_Incidents].[Priority].CurrentMember.Level.Ordinal = 0, [Main_Incidents].[usr_directorate].CurrentMember.Member_Caption, [Main_Incidents].[Priority].CurrentMember.Member_Caption)
MEMBER [Measures].[ParameterValue] AS
IIF([Main_Incidents].[Priority].CurrentMember.Level.Ordinal = 0, [Main_Incidents].[usr_directorate].CurrentMember.UniqueName, [Main_Incidents].[Priority].CurrentMember.UniqueName)
MEMBER [Measures].[ParameterLevel] AS
IIF([Main_Incidents].[Priority].CurrentMember.Level.Ordinal = 0, [Main_Incidents].[usr_directorate].CurrentMember.Level.Ordinal , [Main_Incidents].[Priority].CurrentMember.Level.Ordinal)
SELECT
{
[Measures].[ParameterCaption]
,[Measures].[# Incidents]
,[Measures].[%SLA]
} ON COLUMNS
,{
[Main_Incidents].[Priority].ALLMEMBERS * [Main_Incidents].[usr_directorate].[All],
[Main_Incidents].[Priority].[All] * [Main_Incidents].[usr_directorate].ALLMEMBERS
} ON ROWS
FROM [Model];