topic Dimension Driving Dimension Selection through Fact in DAX Commands and Tips

Dimension Driving Dimension Selection through Fact

Anonymous — Mon, 08 Nov 2021 20:40:03 GMT

A single fact table attaches to two conformed dimensions. Dimension_1 is actively attached. Dimension_2 is inactively attached. For this fact table only, the goal is for Dimension_2 to filter the list of Dimension_1 as associated to the Fact table, but then to disappear from the calculation, allowing only related Dimension_1 records to affect the results. Another way to look at the goal is that Dimension_2 chooses the Dimension_1 values, but then all Fact records associated with Dimension_1 are calculated, ignoring the Dimension_2 choice. Note that other dimensions might be affecting the results, but these describe the interactions of these two dimensions.

For example, I have tried the following DAX that does not accomplish the goal. What does get returned is filtered by both Dim1 and Dim2.

VAR __dim1_list =

CALCULATETABLE(

VALUES('Fact'[Dim1Key]),

USERELATIONSHIP('Fact'[Dim2Key],'Dim2'[Dim2Key])

)

VAR __result =

CALCULATE(

COUNTROWS('Fact'),

__dim1_list

)

I am obviously not understanding something about the processing of the contexts, but not sure what.

Re: Dimension Driving Dimension Selection through Fact

amitchandak — Tue, 09 Nov 2021 03:32:14 GMT

Anonymous , Try one of the two ways

CALCULATE(
COUNTROWS('Fact'),
USERELATIONSHIP('Fact'[Dim2Key],'Dim2'[Dim2Key])
)

CALCULATE(
COUNTROWS(summarize('Fact', 'Fact'[Dim1Key])),
USERELATIONSHIP('Fact'[Dim2Key],'Dim2'[Dim2Key])
)

Re: Dimension Driving Dimension Selection through Fact

Anonymous — Wed, 10 Nov 2021 01:19:58 GMT

It was solved with a bridge table between Dim2 and the Fact table. The bridge contains the appropriate Dim1 and Dim2 pairings, with a relationship {Dim2.Dim2Key, Bridge.Dim2Key} one-to-many join and a {Bridge.Dim1Key, Fact.Dim1Key} many-to-many join. Both joins are uni-directional toward the fact table.

Thanks for your suggestions amitchandak .