BY HOW TO POWER BI · 800K+ SUBSCRIBERS

User-Defined 
Functions
in Power BI

The Next Level of DAX

Stop writing the same DAX logic over and over.
Build a complete library of reusable DAX functions while developing a full report from scratch.

     

This course is excellent. Well paced, clear, applicable examples used throughout. One of the best investments I've been able to include in my PBI journey! I can't wait to hopefully take some more courses from datatraining.io!

Garrett

4
Modules
~6h
Video content
21+
Lessons
2yr
Access included

/01BEFORE UDFs

Have you ever
been there?

Copy-pasted almost the same DAX measures for every single report?

Spent an entire afternoon searching for every measure that needs updating because the business logic slightly changed?


Built a model only you can maintain, because none of the logic is documented or reusable by anyone else on the team?


Rebuilt the same forecasting or time intelligence logic from scratch every time you started a new project?

/02NOW IMAGINE

A different way
to write DAX

Logic that ships once, lives in one place, and updates everywhere it's called.
That's the UDF shift.
DEFINED ONCE CALLED EVERYWHERE RunningTotal() Revenue Margin % Forecast YoY Growth Rolling Avg

Write it once. Use it everywhere.

Writing DAX logic once, naming it, and calling it across every measure that needs it. No more copy-paste. No more maintenance tax. 

Fix it in 30 seconds instead of 30 hours.

A business rule changes, calculation needs an update. You fix it in one place. Every measure that calls it updates automatically. 

Everyone on the team uses the exact same logic.

No more five slightly different versions of the same calculation. One function, one definition. Full clarity and control.

You build faster on every project.

New report, new client, new model. You're calling the same functions instead of reinventing them each time.

/04RIGHT FIT?

Built for Power BI developers
who already know DAX.

THIS IS FOR YOU IF
  • You're comfortable with DAX but solve the same problems over and over in every new project.
  • You've heard about UDFs but haven't had a structured way to learn them properly.
  • You work on teams where consistency matters and you're tired of logic drifting across models.
  • You want to leave behind models that are maintainable, shareable, and don't depend entirely on you.
  • You're serious about operating at a senior level. Thinking in systems, not just measures.
THIS IS PROBABLY NOT FOR YOU IF
  • You're looking for a broad Power BI survey course. This one goes deep on one specific capability.
  • You're new to DAX. Get confident with the fundamentals first before coming back.
  • You work solo on one-off reports with no reuse requirements. The payoff here is in scale.

/05CURRICULUM

From zero to a full
production library.

   4 Modules 

  ~ 4 hours
  16+ lessons

/03 WHAT YOU WILL BUILD

Every visual in this report
is powered by UDFs you build in the course.

The CloudFlow Analytics report is your hand-on canvas. A real, production-quality Finance Dashboard built entirely with UDFs you write from scratch.
End result? A complete library of reusable DAX functions -
time intelligence, forecasting, Pareto, ranking, SVG visuals and a full report.

/06INSTRUCTOR

Write your awesome label here.

Your instructor
Bas Dohmen

I've spent a decade building Power BI solutions for enterprise clients worldwide, sharing everything I learn with a community of 1M+ developers across YouTube, LinkedIn, and TikTok.

UDFs are a fundamental shift in how DAX works. This course gives you my best practices and the mistakes to avoid — things that take months of trial and error to figure out on your own.
800k+
YOUTUBE SUBS
1M+
TOTAL COMMUNITY
10yr+
ENTERPRISE BI

/07ACCESS

One price.
Everything included.

FULL TRAINING       UDFS IN POWER BI

$149  + tax


  All 4 modules 
  Reusable UDF library (TMDL)  
  CloudFlow Analytics Report 
  2 years access + all updates (during that time) 
  Certificate of completion

 

/08FAQ

Do I need to be an advanced DAX user?
No, but you should be comfortable writing basic measures. If you know CALCULATE, FILTER, and SUMX, you're ready. UDFs are the logical next step - and once it clicks, the way you build models changes permanently.
What version of Power BI Desktop do I need?
DAX User-Defined Functions require the September 2025 release or later. If you're on a current version, you're good.
Is this fully self-paced?
Yes, watch it whenever, as many times as you want. There are no cohorts, no live sessions.
How long do I have access?
You get 2 years of access from the date of purchase. That matters here because UDFs are still evolving, as Microsoft ships updates, so do we. You're not just buying what exists today.
What will I actually be able to do differently after this course?
You'll stop rebuilding the same logic from scratch on every project. Instead you'll have a personal UDF library you can drop into any model and a repeatable system for writing clean, reusable DAX. Your reports get faster to build, easier to maintain, and a lot easier to hand off.
Can't I just learn this from YouTube for free?
You'll find bits and pieces out there, including on my own channel. But free content teaches you tricks. This course gives you a system and a 360° view. There's a difference between watching someone build a UDF and walking away with a complete library, best practices, and the mistakes to avoid. Those take months of trial and error to accumulate on your own.
How is this different from a regular DAX course?
Most DAX courses teach you measures. This course teaches you to build reusable logic — functions you write once and deploy across every report, every client, every model. It's the shift from DAX user to DAX architect.
Is there a team or company license?
Yes. Teams of 5 or more get a discounted rate and a single invoice for finance. Email support@datatraining.io or write us in chat (bottom right) with your team size and we'll sort it within 24 hours.
Still have a question?
Reach out at support@datatraining.io or use the chat function and we'll get back to you.

Write it once. 
Scale it everywhere.

Stop rebuilding. Start reusing. Join the developers who've already made the switch.