Getting first member with MDX - mdx

Question

I want to get the expiration date of a product, however, there could be several expiration dates for the products
ProductID | ExpDate | Qty
1 FY12 1000
2 FY12 1000
2 FY14 1000
3 FY13 1000
3 FY15 1000
As you can see there are several dates for a Product, however, I just want the first ExpDate.
this is my query so far
SELECT NON EMTPY
([Product].[ProductID].[ProductID].MEMBERS *
[Primary Expiration Date].[Primary Expiration Year].[Primary Expiration Year].MEMBERS) on ROWS,
NON EMTPY ([Measures].[Qty]) on columns
FROM Sales_Market
WHERE(
{[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Quarter].&[FY12-Q4],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY13],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY14],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY15]})
Any help?
Thanks

Answer 1

You can try this query:
SELECT NON EMTPY
Generate([Product].[ProductID].[ProductID].MEMBERS, Subset(NonEmpty({[Product].CurrentMember} * [Primary Expiration Date].[Primary Expiration Year].[Primary Expiration Year].MEMBERS), 0, 1)) on ROWS,
NON EMTPY ([Measures].[Qty]) on columns
FROM Sales_Market
WHERE(
{[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Quarter].&[FY12-Q4],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY13],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY14],
[Primary Expiration Date].[Primary Expiration Date Hierarchy].[Primary Expiration Year].&[FY15]})
You can add a measure as second argument of NonEmpty if necessary.