The biggest innovations in DAX since 2020 are now in public preview
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NEW ARTICLE
User-defined functions are a new and exciting feature in DAX. This article outlines the key concepts to understand before using them in Power BI projects.
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SQLBI REPLAY
This article introduces the new calendar-based time intelligence functions in DAX, available in preview from the September 2025 release of Power BI.
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CLASSROOM COURSES
Mastering DAX in Chicago & Austin
We are offering only two more classroom courses in the United States in 2025: Chicago and Austin, both with Marco Russo!
Mastering DAX Chicago    Mastering DAX Austin
The goal of these three-day, classroom courses is for the expert trainer to teach all the features of the DAX language, providing the knowledge to write formulas for common and advanced business scenarios. The course includes an overview of the new Calendar feature and the User-defined functions (UDF) in DAX! All the attendees will receive a copy of the e-book, The Definitive Guide to DAX.

Come join Marco before seats run out!
These are our last US courses before the end of the year!

» Chicago: November 12-14, 2025

» Austin: December 8-10, 2025



 

BI-WEEKLY NEWS DIGEST
Latest news
• A chat about DAX UDFs and Calendar-based time intelligence
Jeroen (Jay) ter Heerdt is the Microsoft product manager for DAX. In this 30-minute conversation, Marco and Jay talk about the story of and the expectations for User-defined functions (UDFs) and Calendar-based time intelligence. Recorded on Sep. 16, 2025, at #fabconeurope2025
Sep 20, 2025 · Jeroen ter Heerdt
• Power BI September 2025 update
We dedicated two articles to the important DAX features released this month. We can only add that Performance Analyzer is available while editing a report on the web, TMDL view is not generally available, and Direct Lake on OneLake + import is now available in both Desktop and web modeling experience. So many news this month!
Sep 16, 2025 · Microsoft
• Visit daxlib.org to view, try, and publish public, open-source user-defined functions in DAX!
With the sheer volume of announcements for DAX, you may have missed the fact that SQLBI also launched daxlib.org, a website where you can find public, open-source libraries of DAX functions. There, you can also contribute, upload, and publish your library! Visit the website and read the documentation, it's the easiest way to get started with DAX UDFs...
Sep 16, 2025 · SQLBI
• DAX UDF color library
A helpful DAX library can be something as simple as a list of color names with the corresponding RGB codes! This isn't rocket science; UDFs are here to makes the code more readable and functional.
Sep 16, 2025 · Jake Duddy



SQLBI YOUTUBE CHANNEL
Latest videos
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SUMMARIZECOLUMNS best practices
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Synoptic Panel v2 Launch
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