You're reading from Expert Data Modeling with Power BI Get the best out of Power BI by building optimized data models for reporting and business needs

Product type Paperback

Published in Jun 2021

Publisher Packt

ISBN-13 9781800205697

Length 612 pages

Edition 1st Edition

Languages

DAX

Tools

Power BI

Concepts

Data Analysis

Author (1):

Soheil Bakhshi

View More author details

Table of Contents (18) Chapters

Preface

1. Section 1: Data Modeling in Power BI

2. Chapter 1: Introduction to Data Modeling in Power BI FREE CHAPTER

3. Chapter 2: Data Analysis eXpressions and Data Modeling

4. Section 2: Data Preparation in Query Editor

5. Chapter 3: Data Preparation in Power Query Editor

6. Chapter 4: Getting Data from Various Sources

7. Chapter 5: Common Data Preparation Steps

8. Chapter 6: Star Schema Preparation in Power Query Editor

9. Chapter 7: Data Preparation Common Best Practices

10. Section 3: Data Modeling

11. Chapter 8: Data Modeling Components

12. Chapter 9: Star Schema and Data Modeling Common Best Practices

13. Section 4: Advanced Data Modeling

14. Chapter 10: Advanced Data Modeling Techniques

15. Chapter 11: Row-Level Security

16. Chapter 12: Extra Options and Features Available for Data Modeling

17. Other Books You May Enjoy

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Dealing with SCDs

The term slowly changing dimension, which we usually refer to with its short form, SCD, is a data warehousing concept introduced by the amazing Ralph Kimball. You can learn more about Ralph Kimball here: https://www.kimballgroup.com/about-kimball-group/.

The SCD concept deals with moving a specific set of data from one state to another. Imagine we have a human resources (HR) system; Stephen Jiang is a Sales Manager, having 10 sales representatives in his team. The following screenshot shows the sample data for our scenario:

Figure 12.1 – Stephen Jiang is the sales manager of a team of 10 sales representatives

Today, Stephen Jiang has been promoted to Vice President of Sales, so his team grows in size from 10 to 17. The following screenshot shows the changes:

Figure 12.2 – Stephen's team after he was promoted to Vice President of Sales

Another example is when a customer's address changes in...