Season 2

Namaste Power BI

Episode 20

Iterators & Ranking

⏱ 50:00

Episode Summary

Advanced iterator patterns — RANKX for dynamic ranking, TOPN for top-N analysis, GENERATE for cartesian products, and combining iterators with CALCULATE for powerful calculations.

This is Episode 20 of the free Namaste Power BI course on DevWithData — covering iterators & ranking. Watch the video above, then pass the MCQ checkpoint to unlock the next episode and update your Data Readiness Index score.

Key Takeaways

→RANKX ranks values dynamically based on current filter context
→TOPN returns the top N rows of a table based on an expression
→GENERATE creates a cartesian product of two tables (row by row)
→CONCATENATEX builds delimited strings from table expressions

⚠ Common Interview Pitfalls

•Using RANKX without specifying the tiebreaker order parameter
•TOPN returns a TABLE — wrap it in CALCULATE or SUMX to get a scalar
•Confusing RANKX dense vs skip ranking behavior

Official Reference

Deepen your understanding with official Microsoft documentation.

PL-300 Official Training Course

Microsoft's official instructor-led training for the Power BI Data Analyst certification.

https://learn.microsoft.com/en-us/training/courses/pl-300t00

Power BI Documentation

Complete reference for Power BI Desktop, Power BI Service, and Power BI Embedded.

https://learn.microsoft.com/en-us/power-bi/

Content on DevWithData is original and inspired by official Microsoft resources. The links above point directly to Microsoft Learn — always the authoritative source.

← Ep 19: Time Intelligence Mastery

Ep 21: Variables & Debugging →

Episode Checkpoint

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