October 2018
Beginner
1120 pages
28h 4m
English
Content preview from Excel 2019 Bible
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CHAPTER 38Introducing Power Query
In information management, ETL refers to the three separate functions typically required to integrate disparate data sources: extraction, transformation, and loading. The extraction function refers to the reading of data from a specified source and extracting a desired subset of data. The transformation function refers to the cleaning, shaping, and aggregating of data to convert it to the desired structure. The loading function refers to the actual importing or writing of the resulting data to a target location.
Excel analysts have been manually performing ETL processes for years—although they rarely call it ETL. Every day, millions of Excel users manually pull data from some source location, manipulate that data, and integrate it into their reporting. This amounts to lots of manual effort.
Power Query enhances the ETL experience by offering an intuitive mechanism to extract data from a wide variety of sources, perform complex transformations on that data, and then load the data into a workbook or the internal data model.
In this chapter, you'll explore the basics of Power Query and get a glimpse of how it helps you save time and automate the steps needed to ensure that clean data is imported into your reporting models.
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