MDX showing values of only the best salesmen - mdx

Question

Let's say I have two simple dimensions:
Products - with id and name
Salesmen - with id and name
My fact table is named SALES and contains the ids of the abovementioned.
Let's say product X has been sold by salesmen A, B and C.
Product Y has been sold by salesmen B, C, and D
I want to produce a MDX query which would tell me the names of the salesmen who sold both those products. In this case the result would be B and C
My attempt:
select {null} on 0,
DESCENDANTS (
[Salesmen].[Name].children
) on 1
FROM [Test]
where (
{
(
[Products].[Name].&[X]
)
,
(
[Products].[Name].&[Y]
)
}
)

Answer 1

Please try nesting exist function like this:
SELECT
{} on 0,
EXISTS(
EXISTS(
{[Salesmen].[Name].MEMBERS}, //<<TRY THIS INSTEAD
{[Products].[Name].&[X]}
)
,{[Products].[Name].&[Y]}
)
ON 1
FROM [Test];
Strictly speaking EXISTS requires the name of a measures group as it's third argument like this:
SELECT
{} on 0,
EXISTS(
EXISTS(
{[Salesmen].[Name].MEMBERS} //<<TRY THIS INSTEAD
,{[Products].[Name].&[X]}
,"Reseller Sales" //<<replace with group name from your cube
)
,{[Products].[Name].&[Y]}
,"Reseller Sales" //<<replace with group name from your cube
)
ON 1
FROM [Test];
An alternative approach is to use a member from the hierarchy [Measures] and the functions NonEmpty and Intersect:
SELECT
{} on 0,
INTERSECT(
NONEMPTY(
{[Salesmen].[Name].MEMBERS}
,([Products].[Name].&[X],[Measures].[SomeMeasureInYourCube])
)
,NONEMPTY(
{[Salesmen].[Name].MEMBERS}
,([Products].[Name].&[Y],[Measures].[SomeMeasureInYourCube])
)
)
ON 1
FROM [Test];
The above may well work with a simple tuple of the members of Products only
SELECT
{} on 0,
INTERSECT(
NONEMPTY(
{[Salesmen].[Name].MEMBERS}
,([Products].[Name].&[X])
)
,NONEMPTY(
{[Salesmen].[Name].MEMBERS}
,([Products].[Name].&[Y])
)
)
ON 1
FROM [Test];