Book Image

Expert Data Modeling with Power BI

By : Soheil Bakhshi
Book Image

Expert Data Modeling with Power BI

By: Soheil Bakhshi

Overview of this book

This book is a comprehensive guide to understanding the ins and outs of data modeling and how to create data models using Power BI confidently. You'll learn how to connect data from multiple sources, understand data, define and manage relationships between data, and shape data models to gain deep and detailed insights about your organization. In this book, you'll explore how to use data modeling and navigation techniques to define relationships and create a data model before defining new metrics and performing custom calculations using modeling features. As you advance through the chapters, the book will demonstrate how to create full-fledged data models, enabling you to create efficient data models and simpler DAX code with new data modeling features. With the help of examples, you'll discover how you can solve business challenges by building optimal data models and changing your existing data models to meet evolving business requirements. Finally, you'll learn how to use some new and advanced modeling features to enhance your data models to carry out a wide variety of complex tasks. By the end of this Power BI book, you'll have gained the skills you need to structure data coming from multiple sources in different ways to create optimized data models that support reporting and data analytics.
Table of Contents (18 chapters)
1
Section 1: Data Modeling in Power BI
4
Section 2: Data Preparation in Query Editor
10
Section 3: Data Modeling
13
Section 4: Advanced Data Modeling

Chapter 6: Star Schema Preparation in Power Query Editor

We learned about some common data preparation steps in the previous chapter, including data type conversion, split column, merge columns, adding a custom column, and filtering rows. We also learned how to create summary tables using the Group By feature, appending data, and merging queries.

This chapter will use all the topics we discussed in the past few chapters and help you learn how to prepare a Star Shema in Power Query Editor. Data modeling in Power BI starts with preparing a Star Schema. In this chapter, we'll use the Chapter 6, Sales Data.xlsx file, which contains flattened data. This is a common scenario many of us have faced; we get a set of files containing data that have been exported from a source system, and we need to build a report to answer business questions. Therefore, having the required skills to build a Star Schema on top of a flat design comes in handy.

In this chapter, we will cover the following...