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Anonymous
Not applicable

DAX Measure causes Cartesian product in table

Hi all,

 

I'm having trouble understanding why the following happens (and how to prevent it):

 

I have two tables, which I join via a 1:1 relation on a key.

Joining the two tablesJoining the two tablesth

The result after joining is as expected:

Result after joiningResult after joining

 

Now, when we add a measure: Ones = 1 and add this to the table we get a cartesian product of all project names, and a 1 on each row. Does anyone understand why this happens? 

 

Cartesian product resultCartesian product result

 

Thanks! 

-Nils

1 ACCEPTED SOLUTION
tamerj1
Super User
Super User

@Anonymous 

When you add columns from multiple tables to a visual, Power Bi creates a crossjoin of these columns producing all possible combinations but hideing the non-existing combinations. By returning  a constat as a value you are forcing it to show all the combinations even if they don't exist. 

View solution in original post

5 REPLIES 5
Anonymous
Not applicable

Hey Tamerj1, 

 

Thanks for replying! 

 

If that's the case, how would I then prevent this from happening? Is there any way to detect that it's a non-existing combination (or is there a Power BI setting that let's me always hide non-existing combinations?)

@Anonymous 

You can use

IF ( NOT ISEMPTY ( TableName ), 1 )

Can I ask a follow-up question about your solution, please?

What is TableName?

@chuckbo 

The name of you fact table

tamerj1
Super User
Super User

@Anonymous 

When you add columns from multiple tables to a visual, Power Bi creates a crossjoin of these columns producing all possible combinations but hideing the non-existing combinations. By returning  a constat as a value you are forcing it to show all the combinations even if they don't exist. 

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