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Power BI & DAX

Modeling, DAX and performance for Power BI — star schemas, CALCULATE, time intelligence, and what actually makes reports fast.

DAX Variables (VAR): Why They Fix Half Your Measures

VAR...RETURN makes DAX measures faster, easier to debug and easier to read. See the syntax, the performance reason, and the one gotcha with context transition.

power bidaxdata analyticscalculate

Power BI Row-Level Security: A Practical Setup

Set up Power BI row-level security step by step, static and dynamic, plus the pitfalls that let data leak past a security role.

power birow level securitydata analyticssecurity

Slow Power BI Report? 7 Fixes in Order of Payoff

A slow Power BI report usually has a few clear causes. Measure with Performance Analyzer first, then apply these seven fixes, biggest payoff first.

power biperformanceoptimizationdata modeling

Power Query vs DAX: Where Each Step Belongs

Not sure whether to clean data in Power Query or calculate in DAX? Use this simple rule, with examples for calculated columns, measures and the M language.

power bipower querydaxdata modeling

Power BI design: model first, then calculation groups

A practical guide to Power BI design: star schema, calculation groups, field parameters and dashboard layout habits that keep reports fast and easy to maintain.

power bidata modelingdaxdashboard designbusiness intelligence

Power BI Copilot: what it can and can't do today

What Copilot in Power BI does well, where it breaks, and how to test it on your own semantic model before business users start trusting its answers.

power bicopilotbusiness intelligenceai analytics