When you use Power Query to retrieve data often need to be “purified” before they can continue to be used in the reports. For this purpose you can use a tool called Query Editor. It opens in a separate window, just like Data model, with its own ribbon menus that have a multitude of options for data processing. The following text will be talking about some basic options that allow transformation of data.
Power Query is an Excel add-in that is used to retrieve data from various sources, connecting to them and purging data before we use them to create a report. It manipulates data in a worksheet, managed within structured table, and allows directly adding them the model. First release of Power Query was an optional add-in for Excel. In version 2016 it has become an integral part of the application. This technology is embedded in PowerBI service.