SUMMARIZE Isn’t What You Think — Here’s Proof

Goodly

Goodly

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Doug asked a great question: If the SUMMARIZE function in Power BI can already create new columns, why do we still wrap it with ADDCOLUMNS?

In this video, I dive into the weird behaviour of SUMMARIZE, and more importantly — show you how to uncover it using Investigative DAX.

You’ll learn:
✔ What really happens inside a SUMMARIZE
✔ Why removing filters doesn’t always remove them
✔ How ADDCOLUMNS sidesteps these silent traps
✔ How to debug DAX like a pro using CALCULATETABLE, COUNTROWS, and CONCATENATEX
✔ And what changes when relationships and expanded tables are involved

If you’ve ever scratched your head wondering why a DAX result feels “off” — this video walks you through the exact steps to investigate what’s going wrong and why.

📌 This video will teach you Investigative DAX — a skill that helps you break down complex issues and fix them at the root.



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