Section 2: Data Preparation in Query Editor

In this section, you will learn how to prepare efficient data models in Query Editor. This chapter is all about transitioning from theory to reality. This chapter explains one of the most important aspects of data modeling, which is data preparation. Not everyone has the luxury of having a pre-built data warehouse; therefore, it is important to know how to build dimensions and facts in Query Editor. Power BI leverages the power of Power Query in Query Editor, so this chapter quickly introduces the Power Query language from a data modeling perspective then explains how to make all components needed in the star schema available to then be used in the data model layer in Power BI. We explain different techniques in data modeling along with real-world hands-on scenarios.  We also discuss common pitfalls that can easily turn building a simple report into a nightmare and ways to avoid falling into those traps.

This section comprises...