topic Re: Creating a table in DAX using a fliter in DAX Commands and Tips

Creating a table in DAX using a fliter

Ian_Stuart_Rupe — Wed, 05 Jun 2019 15:47:14 GMT

I am sure there is a way to do this but I am pulling my hair out!

As a DAX table expression this works (returns expected number of rows):

Filtered Fact = FILTER(Fact_Event,Fact_Event[Dim_Student_Key] = 12071)

Whereas this doesn't (does not filter rows at all):

Filtered Fact = FILTER(Fact_Event,Fact_Event[Dim_Student_Key] = [Selected Student Key])

[Selected Student Key] evaluates to 12071 and is an integer.

What am I doing wrong?

Re: Creating a table in DAX using a fliter

Ian_Stuart_Rupe — Wed, 05 Jun 2019 15:52:30 GMT

and [Selected Student Key] is a measure

Re: Creating a table in DAX using a fliter

parry2k — Wed, 05 Jun 2019 16:07:23 GMT

Ian_Stuart_Rupe what is the expression of [Selected Student Key] measure

Re: Creating a table in DAX using a fliter

Ian_Stuart_Rupe — Wed, 05 Jun 2019 17:34:34 GMT

parry2k here you go:

Selected Student Key = SELECTEDVALUE(Dim_Student[Dim_Student_Key])

Re: Creating a table in DAX using a fliter

parry2k — Wed, 05 Jun 2019 17:37:25 GMT

Ian_Stuart_Rupe so your fact doesn't have relationship with Dim_Student?? if yes then why you need to filter, once you filter dim student it will filter fact table?

Re: Creating a table in DAX using a fliter

parry2k — Wed, 05 Jun 2019 17:39:53 GMT

Ian_Stuart_Rupe sorry read your post again, seems like you are trying to create a table with filtered student, unfortunately you cannot pass slicer value to when creating table using DAX and that is the reason your first expression works and 2nd one doesn't.

So question here is why you need a table?

Re: Creating a table in DAX using a fliter

Ian_Stuart_Rupe — Wed, 05 Jun 2019 18:20:46 GMT

Thanks again parry2k The user wants to be able to fliter Dim_Student from attributes that are in Dim_Course. There is no direct relationship between these two tables but there is Fact_Event in between. One to many relationships from dims to the fact and single filter direction.

The filters (which they want on the filter pane) should only show those Dim_Course rows for which there are associated Dim_Student events. Make sense?

Creating this filtered fact table was my idea of a step along the journey to create a filtered Dim_Course table that I could use in the filter.

I suspect there is a better way!!

Re: Creating a table in DAX using a fliter

Ian_Stuart_Rupe — Thu, 06 Jun 2019 07:46:54 GMT

So if I was able to do this in SQL (which I can write :-)) it would look something like this:

SELECT
Course_Code,
Mode_Of_Study
FROM Dim_Course c
INNER JOIN Fact_Event e
ON c.Dim_Course_Key = e.Dim_Course_Key
WHERE e.Dim_Student_Key = @Selected_Student_Key

I suspect I need to use crossfiltering or something but I bascically need a dynamic table that I can use as the source for a filter.