Power BI Basics — Volume 3: DAX, Context & Advanced Calculations

DAX, Context & Advanced Calculations (Intermediate Level)

You’ve learned relationships.

You’ve built measures.

You can create dashboards.

But when interviews go deeper into evaluation context, CALCULATE, iterators, or filter behavior, things start getting confusing.

That’s where Volume 3 begins.

This is not a beginner's guide.

This is the level where you move from “I can write DAX” to

“I understand how DAX behaves.”

What This Volume Covers

This volume is designed around the most tested and misunderstood areas of DAX.

🔹 Module 13: Evaluation Context — The Core of DAX

• Row Context vs Filter Context (clear conceptual clarity)
• Context Transition explained simply
• Why do measures behave differently from calculated columns
• Interview-style conceptual questions

You will finally understand why DAX behaves the way it does.

🔹 Module 14: CALCULATE — The Engine of DAX

• How CALCULATE modifies filter context
• Boolean vs table filters
• Multiple filter conditions
• Real business examples
• Interview traps around CALCULATE

If you master CALCULATE, you master intermediate DAX.

🔹 Module 15: Filter Modification Functions

• ALL
• ALLEXCEPT
• REMOVEFILTERS
• KEEPFILTERS
• Fixing incorrect totals
• Percentage of total scenarios

Learn when and how to remove or preserve filters properly.

🔹 Module 16: Iterators & Row-by-Row Evaluation

• SUM vs SUMX
• COUNT vs COUNTX
• AVERAGE vs AVERAGEX
• Why totals don’t match visible rows
• Practical business logic examples

This is where most candidates fail in interviews.

🔹 Module 17: Working Across Tables

• RELATED
• RELATEDTABLE
• LOOKUPVALUE
• USERELATIONSHIP (intro level)
• When relationships are not enough
• Performance awareness

Understand how tables communicate inside the model.

🔹 Module 18: Debugging & Structuring DAX Professionally

• Using VAR & RETURN
• Breaking complex measures
• Debugging filter context
• Clean measure-writing practices

Start writing DAX like a professional analyst.

🔹 Module 19: Real Interview DAX Scenarios

• % of Total with slicers
• Running totals
• Year-over-Year growth
• Conditional logic
• Dynamic KPI measures

Solve real patterns that appear in interviews.

🔹 Module 20: Rapid Interview Revision

• 15 most repeated DAX conceptual questions
• Structured short answers
• When-to-use-what decision guide
• Final revision checklist before interviews

Perfect for last-minute preparation.

Who This Is For

✔ Power BI learners preparing for interviews

✔ Data analysts moving from beginner to intermediate

✔ SQL learners transitioning into BI roles

✔ Anyone struggling with DAX logic

Who This Is NOT For

✖ Absolute beginners

✖ Advanced optimization-focused users

✖ Enterprise-level modeling specialists

This volume is designed specifically for the intermediate interview stage.

What Makes This Different

This guide does not teach 50 random DAX functions.

It teaches:

• Context
• Filter behavior
• CALCULATE logic
• Real interview thinking

Because interviews test your understanding — not memorization.

If Volume 2 helped you build dashboards,

Volume 3 will help you explain them confidently in interviews.

Move from writing DAX…

to understand DAX.