Book Image

Expert Data Modeling with Power BI - Second Edition

By : Soheil Bakhshi
4 (1)
Book Image

Expert Data Modeling with Power BI - Second Edition

4 (1)
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 full-fledged data models using Power BI confidently. In this new, fully updated edition, 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. As you advance through the chapters, the book will demonstrate how to prepare efficient data models in the Power Query Editor and use simpler DAX code with new data modeling features. You'll explore how to use the various data modeling and navigation techniques and perform custom calculations using the modeling features with the help of real-world examples. 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. Additionally, you'll learn valuable best practices and explore common data modeling complications and the solutions to supercharge the process of creating a data model in Power BI and build better-performing data models. 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 high-performing reports and data analytics.
Table of Contents (22 chapters)
1
Section I: Data Modeling in Power BI
4
Section II: Data Preparation in Query Editor
10
Section III: Data Modeling
13
Section IV: Advanced Data Modeling
20
Other Books You May Enjoy
21
Index

Duplicating and referencing queries

Duplicating and referencing queries are somehow similar. We duplicate a query when we need to have all the transformation steps we already took on the original query. At the same time, we want to change those steps or add more transformation steps. In that case, we must change the original query’s nature, translating it so that it has a different meaning from a business point of view. But when we reference a query, we are referencing the final results of the query. Therefore, we do not get the transformation steps in the new query (the referencing query). Referencing a query is a common way to break down the transformation activities. This is the preferred way of preparing the data for most Extract, Transformation, and Load (ETL) experts and data warehousing professionals. In that sense, we can do the following:

  • We have base queries connected to the source system that resembles the Extract part of the ETL process.
  • We reference...