DAX: doubt with expanded tables

[AlB]

Hi there,

We have an Answers table and a Customers table related through the CustomerKey column. Customers is on the one-side of the relationship and Answers on the many-side. We have the following:

CALCULATE (
      DISTINCTCOUNT ( Customers[CustomerKey] ),
      Answers,
      Answers[AnswerKey] = 6
)

I was expecting the filtering on Answers[AnswerKey] would be visible in Customers, filtering the customers that appear in Answers with Answers[AnswerKey]=6. My reasoning is: we have Answers as expanded table in the filter arguments and further the filter on Answers[AnswerKey]. Answers gets filtered by Answers[AnswerKey] and then, as "filtered expanded table", has an effect on Customers. It does not have any effect from what I see in the results. Would you care to explain why this is so?

Many thanks

[LivioLanzo]

Hi @AlB

The right measure in your case should be:

CALCULATE (
      DISTINCTCOUNT ( Customers[CustomerKey] ),
      CALCULATETABLE( Answers, Answers[AnswerKey] = 6 )
)

[AlB]

Thanks @LivioLanzo

Why does the first example not produce the same results as yours?

Thanks

[LivioLanzo · Accepted solution]

@AlB

The filter you're placing on Answer[Key] = 6 does not propagate to the Customers table. Therefore the only filter  propagating to the customer table is the answer table as it is (without Key = 6 ). 

CALCULATETABLE will create a table filtered by Key = 6 which is then passed to CALCULATE as a filtered argument

The expanded version of Customers does not contain coulmns from the Answer table, unless bi-directional filter is activated, which i dont recommend

[affan]

Hi @AlB

Sharing a sample of your base tables and expected result helps the community to answer. If possible please do share.

Regards,

Affan