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Expert Data Modeling with Power BI

Expert Data Modeling with Power BI

By : Soheil Bakhshi
5 (8)
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Expert Data Modeling with Power BI

Expert Data Modeling with Power BI

5 (8)
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)
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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

Replacing values

In data cleansing, replacing values is one of the most common transformation activities. A simple example is when we have a description column in the source system containing free text, and we want to replace some parts of the description with something else.

Power Query Editor UI uses the Table.ReplaceValue(table as table, OldValue as any, NewValue as any, Replacer as function, columnsToSearch as list) function behind the scenes to replace a value in a table. If we want to replace the value of a List, it uses the List.ReplaceValue(list as list, OldValue as any, NewValue as any, Replacer as function) function. Depending on the value’s data type, the Replacer function can be either Replacer.ReplaceText or Replacer.ReplaceValue. The difference between the two is that we can use Replacer.ReplaceText to replace text values, while we can use Replacer.ReplaceValue to replace any values. For instance, if we want to replace semicolons with colons in a text column...

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