Power BI Desktop - DAX Issue

[Anonymous]

Dear Team,

In DAX calculation, I found one weird case, just wanted to filter the data on some condition.

Here is the DAX that was written -

CALCULATE(SUM(FactTotal[Sales]), FILTER(FactTotal, FactTotal[Key] = 1))

It was returning incorrect data.

But when I changed this to different DAX without FILTER word -

CALCULATE(SUM(FactTotal[Sales]), FactTotal[Key] = 1)

It works fine.

Could anyone please suggest, what went wrong with the first statement.

Thanks,

[Anonymous · Accepted solution]

It's the way DAX works internally. Your second function:

CALCULATE(SUM(FactTotal[Sales]), FactTotal[Key] = 1)

is really

CALCULATE(
    SUM( FactTotal[Sales]),
    FILTER(
        ALL(FactTotal),
        FactTotal[Key] = 1
    )
)

so all removes the current filters and applies you FactTotal[Key] = 1 filter.