The Definitive Guide to Power Query (M): Mastering complex data transformation with Power Query

Greg Deckler

Melissa de Korte

Rick de Groot

€41.99

4.8 (36 Ratings)

Paperback Mar 2024 758 pages 1st Edition

Greg Deckler

Melissa de Korte

Rick de Groot

€41.99

4.8 (36 Ratings)

Paperback Mar 2024 758 pages 1st Edition

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The Definitive Guide to Power Query (M)

Where is M Used?

M is a versatile language that finds application in various tools and platforms where data transformation and manipulation are essential. Its integration within the Power Query ecosystem enables users to leverage M's capabilities in different environments. In this section, we explore some key areas where M is widely used.

Experiences

Before discussing specific products where M is used, it is important to understand the different experiences available for authoring M. There are two experiences available for authoring M. These experiences are the following:

Power Query Desktop – Power Query Desktop is the experience for Power Query found in desktop applications such as Power BI Desktop and Microsoft Excel. While the experiences are similar, there are differences. For example, the artificial intelligence (AI) and machine learning (ML) integrations as well as the integrations with R and Python present in Power BI Desktop are not present in Microsoft Excel. Conversely...

Editing experience-generated code

As pointed out in this chapter’s Your first query section, using the Power Query Desktop experience’s graphical user interface (GUI) to connect to and transform data generates M language code. This code generated can be tweaked or edited using the formula bar.

For example, in the Applied Steps area of the Query Settings pane, by clicking on the Source step for the query and then clicking the down arrow to the far right in the formula bar, you can see the full M language code for the Source step, such as the following:

= Csv.Document(File.Contents("C:\Users\gdeck\OneDrive\Books\The Definitive Guide to Power Query\Chapter 2\Chapter 2 - Product Inventory.csv"),[Delimiter=",", Columns=8, Encoding=1252, QuoteStyle=QuoteStyle.None])

As you can see in this code, there are two nested functions being used to connect to the CSV file, Csv.Document and File.Contents.

The File.Contents function has a single...

Download Code

Key benefits

Get comprehensive coverage of fundamental and advanced Power Query concepts
Gain hands-on experience with practical examples based on real-world problems
Delve into the intricacies of Power Query M language for enhanced data manipulation

Description

Data transformation is a critical step in building data models and business intelligence reports. Power Query is an invaluable tool for anyone who wants to master data transformation, and this book will equip you with the knowledge and skills to make the most of it. The Definitive Guide to Power Query (M) will help you build a solid foundation in the Power Query M language. As you progress through the chapters, you'll learn how to use that knowledge to implement advanced concepts and data transformations. This will set the stage for an uncompromisingly thorough exploration of the Power Query M Language. You'll also get to grips with optimizing performance, handling errors, and implementing efficient data processing techniques. As this is a hands-on guide, the practical examples in the chapters will help you gain the skills to apply Power Query to real-world problems and improve your data analysis capabilities. By the end of this book, you will be able to leverage all of Power Query's remarkable capabilities for data transformation.

Who is this book for?

This book is for business analysts, business intelligence professionals, and power business users working with data who want to add Power Query mastery to their resume. This book will be beneficial for anyone who wants to automate their process of data cleaning and save huge amount of time. Having some basic experience in Power Query is recommended.

What you will learn

Gain a strong understanding of Power Query fundamentals
Master various functions within Power Query to perform complex data operations
Acquire knowledge about values, types, and control structures in Power Query
Develop proficiency in error handling techniques
Learn performance optimization strategies for Power Query
Apply what you've learned to real-world scenarios, including common troublesome patterns

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Richard Martin Apr 29, 2024

Has everything a data cleaner could ask for.

Feefo Verified review

Marian Delibas Jul 23, 2024

practical solutions with concepts not easy to find

Lars Lyager Olsen Nov 09, 2024

N/A May 13, 2024

Brian Julius, Power BI Expert and Instructor Apr 01, 2024

The M language sits on the computers of over one billion Excel and Power BI users worldwide, yet only a very small percentage of those users are aware of its existence, and an even smaller fraction are able to effectively leverage its immense power and flexibility. With over 720 built-in functions (the majority of which are not accessible via the UI), the M language enables you to master nearly any data-related task.One of the reasons M is such an underutilized gem is that in the fourteen years of its existence, no one (until now) has written a comprehensive guide to M coding. The three authors of this book are among the most experienced and knowledgeable M experts in the world, and do a brilliant job guiding the reader from the fundamental concepts of M through its most advanced functions and applications.This book is neither a quick nor easy read, but will reward careful study with deep understanding and dramatically increased abilities in data cleaning, transformation, modeling, automation, and analysis.

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The Definitive Guide to Power Query (M): Mastering complex data transformation with Power Query

What do you get with Print?

The Definitive Guide to Power Query (M)

Where is M Used?

Experiences

M Language Basics

Summary

Editing experience-generated code

Creating custom columns

Adding an index column

Using the Advanced Editor

Summary

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