Help understand MSDN solution from SSRS dropdown and SSAS cube?

Question

Basically, my problem is that the dropdown in my SSRS report is displaying every single day in my Date Dimension, so it's showing everything from 20000101 to 20201231. I would only like to display the dates that are included in my fact table; right now,
my fact table only has two days.
I looked at the following post, and it has the correct solution by Vinuthan: 
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/161e54c6-f258-4963-8d18-58addf7f2280/correct-time-dimension-settings-to-hide-extra-years-in-drop-list?forum=sqlanalysisservices
Basically, the solution is the following:
This should be moved to the reporting layer/done at the place where drop down is populated. For example,
If i have a report that shows analysis based on certain measure values, then in that report...the mdx used to generate that parameter value should be tweaked by adding NONEMPTY([].[].members, measurevalue)
The problem is that I don't know how to create this MDX query. Both [DimDate] and [Fact] have [DateKey]:
[Fact].[DateKey] is a foreign key to [DimDate].[DateKey].
Any help is appreciated.
VM

Answer 1

Hi VM,
it depends what you use as source database. If it is SQL relational database.
get values for your parameter using select statement from dim date using inner join to your fact table
it could look like this
SELECT ParameterValue = DateInt
FROM DimDate d
INNER JOIN FactTable f ON d.DateKey = f.DateKey
ORDER BY DateINT
If you use as source MDX query from olap cube you would use function NONEMPTY and your select could look similar to this one
SELECT
   {} ON COLUMNS,
NONEMPTY(
{[DimDate].[DateInt].[DateInt]},[Measures].MeasureName)
ON ROWS
FROM CUBE
Jiri Neoral