HASONEVALUE DAX Function (Information)

Returns true when there’s only one value in the specified column.

Syntax

HASONEVALUE ( <ColumnName> )
Parameter Attributes Description
ColumnName

The column to check the filter info.

Return values

Scalar A single boolean value.

TRUE when the context for ColumnName has been filtered down to one distinct value only. Otherwise is FALSE.

Remarks

HASONEVALUE corresponds to the following code:

COUNTROWS ( VALUES ( <ColumnName> ) ) = 1
» 2 related articles
» 2 related functions

Examples

--  HASONEVALUE checks that a column has only one value 
--  visible in the current filter context
DEFINE
    MEASURE Sales[Audio only] =
        CALCULATE (
            HASONEVALUE ( 'Product'[Category] ),
            'Product'[Category] = "Audio"
        )
    MEASURE Sales[Audio and computers] =
        CALCULATE (
            HASONEVALUE ( 'Product'[Category] ),
            'Product'[Category] IN { "Audio", "Computers" }
        )
    MEASURE Sales[Audio and bananas] =
        CALCULATE (
            HASONEVALUE ( '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

Related articles

Learn more about HASONEVALUE in the following articles:

Related functions

Other related functions are:

Last update: Oct 22, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/hasonevalue-function-dax

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Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.

Iterator

Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.

Deprecated

This function is deprecated. Jump to the Alternatives section to see the function to use.

Deprecated

This parameter is deprecated and its use is not recommended.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.

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