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Practical Challenges
Sharpen your skills with interactive exercises and daily challenges designed around real Power BI reports.
Prompt · Verify · Publish
Anyone can prompt.
Few can verify.
AI writes DAX. You sign off on it. DAX Solver is where analysts train the judgment that prompts can’t fake.
6
Courses
500+
Questions
All
DAX Functions
Free
No Credit Card
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-- YoY revenue growth VAR CurrentYear = CALCULATE( SUM(Sales[Amount]), YEAR('Date'[Date]) = 2025 ) VAR PriorYear = CALCULATE( SUM(Sales[Amount]), DATEADD('Date'[Date], -1, YEAR) ) RETURN DIVIDE(CurrentYear - PriorYear, PriorYear)
● 3 of 4 test cases passing
Overheard in BI
The Silent Failure Problem
Wrong DAX doesn’t break.
Wrong DAX doesn’t break.
It returns incorrect data.
Most languages fail loudly. DAX doesn’t. A wrong measure returns a number — not an error — and that number ends up in dashboards, board decks, and the decisions your business runs on. In the age of Copilot, where AI writes the measure and a human just pastes it, that’s how quiet bugs become loud mistakes.
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-- Looks reasonable. Returns a number. AVERAGE(Sales[Amount])
● Returns $84.12
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-- What the business actually means. DIVIDE( SUM(Sales[Amount]), DISTINCTCOUNT(Sales[OrderID]) )
● Returns $247.60
Same model. Same question. Different answers.
Copilot will happily write either. You have to know which.
What’s Inside
Train the skill AI can’t give you.
Every tool here is built for one thing: the hands-on reps that turn a DAX learner into someone their team trusts to sign off on the number.
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Smart Code Editor
Write, test, and optimize your DAX expressions with autocomplete, code formatting, and syntax highlighting.
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AI That Teaches, Not Dumps
Daxie nudges you toward the answer instead of handing it over — so the understanding is yours, not the model’s.
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Progress Tracking
Track your DAX journey with custom analytics that highlight your strengths, areas for improvement, and overall progress.
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Multi-Model Querying
Run DAX queries across multiple semantic models — Finance, HR, Retail, Manufacturing, and more.
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Community Challenges
Tackle challenges from real practitioners, built on real-world use cases — and share your own.
How It Works
Four steps to a measure you can defend.
You won’t just write DAX that runs. You’ll know why it’s right.
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Step 01
Pick a Challenge
Browse hundreds of problems across Finance, HR, Retail, and more — filtered by skill level, model, or topic.
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Step 02
Write Your DAX
Use our intelligent editor with autocomplete, formatting, and hover docs. Inspect the model and run your measure against the test suite.
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Step 03
Get AI-Powered Help
Stuck? Ask Daxie for a hint. Keep iterating until every test case passes — and you’ve truly learned the concept.
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Step 04
Track Your Progress
Watch your skills grow with custom analytics — personal bests, streaks, and the areas where you’ve leveled up.
Real Models
Practice where production lives.
Real semantic models with role-playing dimensions, inactive relationships, and the kind of ambiguity that trips up both beginners and Copilot. Train on the shapes your org actually ships — not a toy star schema.
Finance
Retail
HR
Marketing
Manufacturing
Healthcare
Education
SaaS
Courses
Hands-on Courses, All Free.
Six guided courses built around the AdventureWorks dataset — from fundamentals to advanced techniques. Practice real DAX against real data, one problem at a time.
01
Fundamentals.
Variables, measures, and your first CALCULATE. The foundation every analyst needs.
Beginner
View course →
02
Time Intelligence.
Year-over-year growth, moving averages, and custom date calculations done right.
Intermediate
View course →
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Filter Context.
ALL, CALCULATE, FILTER — the pattern that trips up both beginners and Copilot.
Core skill
View course →
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Logical Functions.
IF, IFERROR, COALESCE, ISNUMBER. Handle blanks, errors, and edge cases cleanly.
Core skill
View course →
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Community-inspired Practice.
140 problems pulled from real forum questions — the gotchas the docs don’t cover.
140 problems
View course →
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Text Functions.
UPPER, LOWER, LEFT, MID, REPLACE, SUBSTITUTE, FORMAT, SEARCH — string wrangling in DAX.
Text manipulation
View course →
The Right Kind of AI
An AI that teaches the eye, not just the answer.
Most AI writes DAX for you. Daxie trains you to spot when the AI is wrong. Ask about a function, a filter-context gotcha, or why your measure returns blank — and get guidance that makes you the expert, not the chatbot.
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Explains DAX Concepts Clearly.
Ask Daxie to break down CALCULATE, filter context, or any DAX concept — and get explanations that actually help you learn.
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Understands Your Context.
Attach your current code or the last error with one click. Daxie sees the whole picture before offering guidance.
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Helps You Truly Learn.
Daxie guides you toward the answer instead of just handing it over — so you build real DAX skills along the way.
Daxie
Your DAX Tutor
Why does my
CALCULATE return blank?
current code
Great question! Let’s walk through it together. Take a look at what your filter argument is doing to the row you’re measuring.
Try wrapping it in
Try wrapping it in
VALUES('Date'[Year]) and let me know what changes.
Ask about DAX functions, syntax, or how to approach this problem…
📎 Attach current code
⚠ Attach error
Evidence
What silent failure sounds like in the wild.
Real posts from Power BI and DAX practitioners on Reddit. Every one of them is describing the same thing: DAX that ships wrong, models that behave unexpectedly, measures that look right but aren’t.
Most of the problems I see with customers are where Copilot is generating the correct answer to a question that is not the one the customer thought they were asking.
My favorite, the total is wrong since it’s not calculating from the individual rows… I don’t want know how many hours I tried to debug it.
Making sure data flows don’t silently corrupt something downstream, that replays don’t double count.
There is no such thing as a CORREL function in DAX and this page is a distraction in the search results.
A lot of measures are technically correct… but still perform really badly. What’s tricky is the result is still correct, so at first everything looks fine.
…a very confident-looking but slightly wrong number. And slightly wrong in OEE can mean big operational decisions.
One semantic slip (answering a different question) and you get a measure that ‘works’ but is wrong.
I tried to recreate their total and came up with a different number, they dropped it instead of having the conversation.
The hardest thing about DAX is that, depending on what you’re doing, you can’t debug the steps to see what’s going on… You’re out of luck.
We have around 20 reports all linked to the same dataset… So why on earth is this measure returning a value 55M less than it should be?
How wrong copilot can be for it’s own major product.
I should be getting 1220 but I get 1420.
FAQ
Frequently Asked Questions.
What’s included in the free plan?
Six DAX queries per day, access to a curated set of problems and all free courses, plus Daxie AI. It’s enough to build a real practice habit — no credit card required.
Do I need a Power BI license?
Not at all. DAX Solver runs entirely in your browser against our own semantic model engine. No Microsoft account, no install — just start practicing.
How is this different from a DAX book or course?
Books and videos teach you concepts. DAX Solver lets you practice them hands-on, with real semantic models and instant feedback from the test suite — so you actually build the skills.
Can I use my own semantic model?
Yes! On the Professional plan, you can upload your own .pbit files, define test cases, and practice against production-shaped data. Enterprise plans allow sharing private challenges across your team.
Is my code private?
Yes. Your solutions stay yours — they’re never shared with other users unless you explicitly choose to share them. More importantly, your keystrokes are never used to train AI models. We only use your data to power your personal progress and dashboards.
Can I cancel anytime?
Yes. Paid plans are month-to-month (or annual with 20% off). You can cancel anytime and keep access through the end of your billing period.
Still have questions? ✉ Contact our support team
For Teams
Make sure your analysts can verify, not just prompt.
Onboard new analysts on real models. Run skill audits before you stake a quarter on a project. Screen candidates against your own schema — not a generic coding quiz.
Be the analyst
they trust.
Prompts are cheap. Verification is the skill. Start building it today — free, no credit card.