How does the HASONEFILTER function (DAX) work?

HASONEFILTER function (DAX) returns TRUE when the number of directly filtered values on columnName is one; otherwise returns FALSE.

HASONEFILTER Formula Syntax

HASONEFILTER(<columnName>)

How do you use the HASONEFILTER function?

It returns TRUE when the number of directly filtered values on columnName is one and only one. Otherwise, returns FALSE.

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Considerations when using the HASONEFILTER function

This function is similar to HASONEVALUE() with the difference that HASONEVALUE() works based on cross-filters while HASONEFILTER() works by a direct filter.

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Formula examples using the HASONEFILTER function

=IF(HASONEFILTER(ResellerSales_USD[ProductKey]),FILTERS(ResellerSales_USD[ProductKey]),BLANK())  

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