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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

Managing columns

After connecting to a data source from Power Query and after having selected the table to which it is connected, it is best practice to reduce and delete all data that is not relevant for the preparation and transformation processes and therefore for reporting.

You have the possibility to choose the columns you want to work with, thereby reducing the amount of data involved. With this recipe, we will see how to quickly and intuitively select columns in order to speed up the data preparation process.

Getting ready

For this recipe, you need to download the FactResellerSales comma-separated values (CSV) file into your local folder.

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

How to do it…

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

  1. Click on Get Data and select the Text/CSV connector.
  2. Browse to your local folder where you downloaded the FactResellerSales CSV file and...
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