Book Image

Hands-On Business Intelligence with DAX

By : Ian Horne
Book Image

Hands-On Business Intelligence with DAX

By: Ian Horne

Overview of this book

Data Analysis Expressions (DAX) is known for its ability to increase efficiency by extracting new information from data that is already present in your model. With this book, you’ll learn to use DAX’s functionality and flexibility in the BI and data analytics domains. You’ll start by learning the basics of DAX, along with understanding the importance of good data models, and how to write efficient DAX formulas by using variables and formatting styles. You’ll then explore how DAX queries work with the help of examples. The book will guide you through optimizing the BI workflow by writing powerful DAX queries. Next, you’ll learn to manipulate and load data of varying complexity within Microsoft products such as Power BI, SQL Server, and Excel Power Pivot. You’ll then discover how to build and extend your data models to gain additional insights, before covering progressive DAX syntax and functions to understand complex relationships in DAX. Later, you’ll focus on important DAX functions, specifically those related to tables, date and time, filtering, and statistics. Finally, you’ll delve into advanced topics such as how the formula and storage engines work to optimize queries. By the end of this book, you’ll have gained hands-on experience in employing DAX to enhance your data models by extracting new information and gaining deeper insights.
Table of Contents (18 chapters)
Section 1: Introduction to DAX for the BI Pro
Section 2: Understanding DAX Functions and Syntax
Section 3: Taking DAX to the Next Level

Using DAX Variables and Formatting

In this chapter, we will focus on how to use DAX variables and the overall impact of using them in your code. The usage of DAX variables will not only improve the re-usability of your code but potentially make it more efficient as well. Apart from this, we will talk about the recommended formatting rules for DAX code and how using these features will help us identify and debug errors in our code.

Then, you will be introduced to the VAR and RETURN keywords and will learn how to effectively use them within your DAX code. We will also go through a practical example of using variables and formatting rules to debug a DAX measure that is not working correctly.

This chapter has been broken down into the following sections:

  • Getting started with DAX variables
  • Formatting your DAX code
  • Debugging errors in your DAX code