Boolean DAX Data type

The Boolean data type is used to express logical conditions. For example, a calculated column defined by the following expression is of Boolean type:

= Sales[Unit Price] > Sales[Unit Cost]

You will also see Boolean data types as numbers where TRUE equals 1 and FALSE equals 0. This sometimes proves useful for sorting purposes because TRUE > FALSE.

The Boolean data type is nullable and can store BLANK values.
Comparison operators return only TRUE or FALSE instead of preserving BLANK values, with one exception. There is an optimization when a boolean expression is compared to constant TRUE: the DAX engine will simply return the boolean expression directly bypassing operator= completely. There is no optimization when a boolean expression is compared to constant FALSE, so operator= is executed.
If you just want to get rid of the BLANK values in a boolean expression, you can use COALESCE( …, FALSE).

Last update: Sep 5, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo, Guillermo Fernandez Vizcaino, Jeffrey Wang

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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.


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.


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


A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.


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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