HASONEFILTER DAX Function (Information)
Returns true when the specified table or column has one and only one value resulting from direct filter(s).
Syntax
HASONEFILTER ( <ColumnName> )
| Parameter | Attributes | Description |
|---|---|---|
| ColumnName |
The column to check the filter info. |
Return values
Scalar A single boolean value.
TRUE when the number of directly filtered values on ColumnName is one; otherwise returns FALSE.
Remarks
This function is similar to HASONEVALUE with the difference that HASONEVALUE works based on cross-filters while HASONEFILTER works by a direct filter.
HASONEFILTER corresponds to the following code:
COUNTROWS ( FILTERS ( <ColumnName> ) ) = 1
Examples
-- HASONEFILTER checks whether a column is being filtered
-- with only one value.
--
-- Filters on non-existing values are not considered
DEFINE
MEASURE Sales[Audio only] =
CALCULATE (
HASONEFILTER ( 'Product'[Category] ),
'Product'[Category] = "Audio"
)
MEASURE Sales[Audio and computers] =
CALCULATE (
HASONEFILTER ( 'Product'[Category] ),
'Product'[Category] IN { "Audio", "Computers" }
)
MEASURE Sales[Audio and bananas] =
CALCULATE (
HASONEFILTER ( 'Product'[Category] ),
'Product'[Category] IN { "Audio", "Bananas" }
)
EVALUATE
{
( "Audio only", [Audio only] ),
( "Audio and computers", [Audio and computers] ),
( "Audio and bananas", [Audio and bananas] )
}
| Value1 | Value2 |
|---|---|
| Audio only | true |
| Audio and computers | false |
| Audio and bananas | true |
-- HASONEFILTER is not HASONEVALUE.
-- A column can have only one value visible because of
-- cross-filtering.
DEFINE
MEASURE Sales[Has One Filter] =
CALCULATE (
HASONEFILTER ( 'Product'[Category] ),
'Product'[Product Name] = "Contoso 512MB MP3 Player E51 Silver"
)
MEASURE Sales[Has One Value] =
CALCULATE (
HASONEVALUE ( 'Product'[Category] ),
'Product'[Product Name] = "Contoso 512MB MP3 Player E51 Silver"
)
EVALUATE
{
( "Has One Filter", [Has One Filter] ),
( "Has One Value", [Has One Value] )
}
| Value1 | Value2 |
|---|---|
| Has One Filter | false |
| Has One Value | true |
-- A column can be filtered without showing any values,
-- because of cross-filters
DEFINE
MEASURE Sales[Has One Filter] =
CALCULATE (
HASONEFILTER ( 'Product'[Category] ),
'Product'[Category] = "Home Appliances",
'Product'[Product Name] = "Contoso 512MB MP3 Player E51 Silver"
)
MEASURE Sales[Are there any products?] =
CALCULATE (
COUNTROWS ( 'Product' ) > 0,
'Product'[Category] = "Home Appliances",
'Product'[Product Name] = "Contoso 512MB MP3 Player E51 Silver"
)
EVALUATE
{
( "Has One Filter", [Has One Filter] ),
( "Are there any products?", [Are there any products?] )
}
| Value1 | Value2 |
|---|---|
| Has One Filter | true |
| Are there any products? | false |
Related functions
Other related functions are:
Last update: Nov 5, 2025 » Contribute » Show contributors
Contributors: Alberto Ferrari, Marco Russo
Microsoft documentation: https://docs.microsoft.com/en-us/dax/hasonefilter-function-dax
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