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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

Combining multiple files

While working with your data, you may need to automatically combine multiple files. You could use the append transformation method, but if you imagine a use case where there are files loaded into a folder with a defined frequency and you need to see the new data coming at each refresh, it is clear that an alternative method is needed. In this recipe, you will see how to connect and combine multiple files with just a few clicks, regardless of how many there are in the folder.

Getting ready

For this recipe, to test different types of file connectors, you need to download a CSVFiles folder containing CSV files, as shown in the following screenshot:

Figure 5.28 – Local folder with CSV files

In this example, I will refer to the following path: C:\Data\CSVFiles.

How to do it…

Open the Power BI Desktop application to perform the following steps:

  1. Go to Get Data, then click on the Folder connector. You can...
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