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Power Query Cookbook

You're reading from   Power Query Cookbook Use effective and powerful queries in Power BI Desktop and Dataflows to prepare and transform your data

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Product type Paperback
Published in Oct 2021
Publisher Packt
ISBN-13 9781800569485
Length 412 pages
Edition 1st Edition
Languages
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Author (1):
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Andrea Janicijevic Andrea Janicijevic
Author Profile Icon Andrea Janicijevic
Andrea Janicijevic
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Table of Contents (12) Chapters Close

Preface 1. Chapter 1: Getting Started with Power Query 2. Chapter 2: Connecting to Fetch Data FREE CHAPTER 3. Chapter 3: Data Exploration in Power Query 4. Chapter 4: Reshaping Your Data 5. Chapter 5: Combining Queries for Efficiency 6. Chapter 6: Optimizing Power Query Performance 7. Chapter 7: Leveraging the M Language 8. Chapter 8: Adding Value to Your Data 9. Chapter 9: Performance Tuning with Power BI Dataflows 10. Chapter 10: Implementing Query Diagnostics 11. Other Books You May Enjoy

Writing queries with M

Once you become more confident with modifying existing steps that were created using the UI, you can further explore M language by creating elements such as values, lists, or tables without connecting to data sources, but directly coding from the Advanced Editor. In this recipe, we will see how M language works when writing queries from scratch. You will perform numerical operations, define variables, and create lists and simple tables.

Getting ready

In this recipe, you need to download the FactInternetSales.csv file.

In this example, we will refer to the C:\Data folder.

How to do it…

Once you open your Power BI Desktop application, you are ready to perform the following steps:

  1. Click on Get Data and select the Blank query connector:
    Figure 7.33 – Text/CSV connector

    Figure 7.33 – Text/CSV connector

  2. The Power Query UI will pop up and you will see an empty query with its default name as Query1:

    Figure 7.34 – Blank query

  3. Browse to the Home tab and...
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