DAX Guide

內容

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.
  • Financial functions
    Financial functions corresponding to Excel functions with the same name.
  • Information functions
    Information functions provide information about data type or filter context of the argument provided.
  • Logical functions
    Logical functions act upon an expression to return information about the values or sets in the expression.
  • Math and Trig functions
    The mathematical functions in DAX are very similar to the Excel mathematical and trigonometric functions.
  • Other functions
    These are special functions that cannot be classified in other categories.
  • Parent-child functions
    These functions helps flattening a parent-child relationship in a regular one.
  • Relationships management functions
    These functions manage and manipulate relationships between tables.
  • Statistical functions
    Statistical aggregation functions.
  • Table manipulation functions
    These functions manipulate and return tables.
  • Text functions
    Text functions manipulate strings.
  • Time Intelligence functions
    Time intelligence functions support calculations to compare and aggregate data over time periods, supporting days, months, quarters, and years.

Statements, Operators and Data types

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

Updates

Latest DAX functions released:

» See all the latest updates

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 Microsoft 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: Feb 28, 2024

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連結
https://dax.guide/
總結
The DAX language is designed for handling data models using formulas and expressions in Microsoft products like Power BI, Analysis Services, and Power Pivot. DAX functions are categorized into aggregation, date and time, filter, financial, information, logical, math and trig, statistical, table manipulation, text, time intelligence, parent-child, and relationships management functions. The DAX Guide provides references for functions, operators, statements, and data types. The guide is regularly updated with new functions and integrates Microsoft documentation. It offers compatibility matrices for DAX functions across different versions/products. The content is curated by authors and contributions are welcomed. DAX Guide is a project by SQLBI, with the latest update in February 2024.