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Rdarshana's avatar
Rdarshana
Helper II
2 years ago
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Formula Explanation

Hi, Can someone explain to me what this formula does -  ID Count = COUNTROWS(DISTINCT(SELECTCOLUMNS('Fact 1', "ID Column", RELATED('Dim 2 '[ID Column])))) From what I understand, we are pic...
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  • Anonymous's avatar
    Anonymous
    2 years ago

    Hi Rdarshana ,

    I created a sample pbix file(see the attachment), you can find the details in it. And for below formula, it will return the count of ID in the table 'Fact 1' which ID also in the dimenison table 'Dim 2'. However, it will also include the IDs in 'Fact 1' table which not exist in the table 'Dim 2' as blank values. All these blank values count as 1. Please check the below screenshot:

    ID Count = COUNTROWS(DISTINCT(SELECTCOLUMNS('Fact 1', "ID Column", RELATED('Dim 2 '[ID Column]))))

    So you can update the forumula as below to get the correct count of ids.

    ID Count_new =
COUNTROWS (
    FILTER (
        DISTINCT (
            SELECTCOLUMNS ( 'Fact 1', "ID Column", RELATED ( 'Dim 2'[Dim ID] ) )
        ),
        [ID Column] <> BLANK ()
    )
)

    Best Regards

MattAllington's avatar
MattAllington
Community Champion
2 years ago

That's what it looks like to me, but it also looks overly complex. Assuming Dim ID in dim 2 is the primary key, this should work. 

 

ID Count = calculate(countrows('Dim 2 '),'Fact 1')

Or this next version is a bit easier to understand 

Calculate(countrows('Dim 2'),crossfilter(fact1[key],DIM2[key],BOTH))

 

They both do the same thing; force the fact table to filter the Dim table based on the existence of matching data in the fact table.