The DAX language

The DAX language was created specifically for the handling of data models, through the use of formulas and expressions. DAX is used in several Microsoft Products such as Microsoft Power BI, Microsoft Analysis Services and Microsoft Power Pivot for Excel. These products all share the same internal engine, called Tabular.

Functions

Browse DAX functions alphabetically from the sidebar or choose a category below:

  • • Aggregation functions

    Aggregation functions return a scalar value applying an aggregation function to a column or to an expression evaluated by iterating a table expression.

  • • Date and Time functions

    Date and time functions help creating calculations based on dates and time. Many of the functions in DAX are similar to the Excel date and time functions.

  • • Filter functions

    Filter functions manipulate table and filter contexts.

  • • Information functions

    Information functions provide information about data type or filter context of the argument provided.


Statements, Operators and Data types

As well as for functions, DAX Guide provides a reference for other entities such as:

About this Reference

The curated content of DAX Guide makes it a go-to reference on the DAX language.

DAX Guide is updated automatically, through the monitoring of new versions of Microsoft products. For every DAX function, DAX Guide offers a compatibility matrix for versions/products supported. Every function/argument is marked with attributes highlighting its behavior regarding row context and context transition.

DAX Guide integrates and expands on the MSDN documentation.

About the Authors

The content of DAX Guide is curated by a small number of authors referenced in each page.

Contributions and suggestions are welcome.


DAX Guide is a project by SQLBI.

Last site update: Oct 19, 2018

DAX Conventions
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.

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.

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