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The Definitive Guide to Power Query (M)

You're reading from The Definitive Guide to Power Query (M)

Product type Book

Published in Mar 2024

Publisher Packt

ISBN-13 9781835089729

Pages 758 pages

Edition 1st Edition

Languages

Concepts

Authors (3):

Gregory Deckler

Rick de Groot

Melissa de Korte

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Table of Contents (19) Chapters

Preface

Introducing M

Working with Power Query/M

Accessing and Combining Data

Understanding Values and Expressions

Understanding Data Types

Structured Values

Conceptualizing M

Working with Nested Structures

Parameters and Custom Functions

Dealing with Dates, Times, and Durations

Comparers, Replacers, Combiners, and Splitters

Handling Errors and Debugging

Iteration and Recursion

Troublesome Data Patterns

Optimizing Performance

Enabling Extensions

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Index

The formula firewall

When working with queries, combining different data sources is common. It’s likely that after some fiddling you run into an error that prevents you from combining your data. This error is the result of the formula firewall that Power Query has, also known as the data privacy firewall. So, what exactly is the formula firewall, and how can you work with it?

What is the formula firewall?

The formula firewall is a Power Query feature that prevents accidental data transfer between sources. This feature is particularly important when dealing with sensitive information. It was designed because of query folding. Query folding allows Power Query to convert data transformations into a data source query that a data source can execute directly.

Imagine a situation where you’re working with two queries in Power Query. Query1 holds sensitive information, like social security numbers. Using an inner join, you aim to use this data to extract relevant...

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Authors (3)

Gregory Deckler

Greg Deckler is a 7-time Microsoft MVP for Data Platform and an active blogger and Power BI community member, having written over 6,000 solutions to community questions. Greg has authored many books on Power BI, including Learn Power BI 1st and 2nd Editions, DAX Cookbook, Power BI Cookbook 2nd Edition and Mastering Power BI 2nd Edition. Greg has also created several external tools for Power BI and regularly posts video content to his YouTube channels, Microsoft Hates Greg and DAX For Humans.

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Rick de Groot

Rick de Groot was born in the Netherlands and has been working in BI for more than 14 years. He went freelance in 2016 and now works as an independent Power BI consultant. On his mission to make Power BI more accessible, he started two blogs: BI Gorilla and PowerQuery. how, and a YouTube channel sharing Power Query and Power BI content. His commitment to offering free content through multiple platforms has led him to earning the Microsoft Data Platform MVP award for two consecutive years.

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Melissa de Korte

Melissa de Korte's approach to facing challenges is fueled by relentless curiosity. She is a dedicated community member and content creator. Her portfolio includes blogs, tutorials, courses, and webinars, that make Power Query M more accessible and useful for all. Behind her professional persona lies a genuine dedication to empowering others through education and knowledge sharing, and a desire to encourage professionals to embrace the potential of Power Query, M.

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