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

Merging columns

A typical transformation under the Add Column category is Merge Columns. There are many use cases where we need to merge the data that's been spread across different columns, such as merging First Name, Middle Name, and Last Name to create a Full Name column, or merging a multipart address that's being held in separate columns (AddressLine1, AddressLine2) to get an Address column containing the full address. Another common use case is to merge multiple columns to create a unique ID column. Let's continue with an example from the Chapter 5, Common Data Preparation Steps.pbix sample file:

  1. Select the Customer table from the Queries pane of Power Query Editor.
  2. Select the First Name, Middle Name, and Last Name columns.
  3. Right-click one of the selected columns and click Merge Columns. Alternatively, we can click the Merge Column button from the Transform tab (shown in yellow in the following image).
  4. Select Space from the Separator dropdown...