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Power Query M Mastery for Power BI Professionals: Advanced Data Transformation, Performance Optimization, and Real-World M Techniques for Analysts Who
Paperback
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Publisher: Independently Published
Published: Feb 12 2026
Pages: 186
Weight: 0.59
Height: 0.40 Width: 6.14 Depth: 9.21
Language: English
Most Power BI professionals hit the same wall.
Your reports work. Your transformations run. But deep down, you know you're still reacting instead of controlling. Queries slow down without warning. A small schema change breaks everything. The UI feels convenient-until it doesn't.
And when things go wrong, you're left staring at M code that feels just unfamiliar enough to be dangerous.
Power Query M Mastery for Power BI Professionals was written for that moment.
This is not another surface-level guide that repeats what the interface already shows you. This is the book that finally explains what's happening underneath-and teaches you how to take full control of it.
If you already use Power Query and Power BI regularly, this book will move you from competent to confident. From advanced user to trusted authority. You'll stop guessing. You'll start designing.
Because once you understand how M evaluates expressions, how the engine processes transformations, and how query folding truly works, everything changes. Performance becomes predictable. Errors become readable. Complex data stops feeling intimidating.
You don't just build transformations anymore-you architect them.
What You'll Discover Inside
- Why UI-only Power Query skills eventually fail-and how to move beyond them
- How M evaluates expressions and why that knowledge changes everything
- The functional programming principles behind Power Query
- How to design readable, maintainable queries that survive real-world change
- Query folding explained clearly-without shortcuts or myths
- Using type awareness to dramatically improve performance
- Expanding, reshaping, and transforming nested data with precision
- Advanced text parsing techniques beyond what the UI can generate
- Handling messy, inconsistent, real-world data with confidence
- Identifying slow queries and eliminating hidden bottlenecks
- Writing modular, future-proof M code others can understand and extend
- Creating and using custom functions to eliminate duplication
- Connecting to APIs and non-standard sources safely and effectively
- Designing robust queries for unstable data environments
- Translating business problems into clean, scalable M logic
This book focuses on judgment, clarity, and control.
You'll learn when to stop clicking and start coding. When to simplify instead of overengineer. When to push logic upstream-and when to keep it in M. You'll begin to see patterns in transformations that once felt random. You'll anticipate problems before they surface.
And perhaps most importantly, you'll develop the ability to explain and defend your design decisions with authority.
That's what separates a capable analyst from a Power Query professional others rely on.
If you're ready to stop patching fragile queries and start building solutions that scale, this book will meet you exactly where you are-and take you further than you expected.
Open the cover. Take control of M.
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