# DAX Functions in Power BI

Data Analysis Expressions (DAX) allow you to take your Power BI skills to the next level by writing custom functions.

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## Course Description

DAX, or Data Analysis eXpressions, is a formula language used in Microsoft Power BI to create calculated columns, measures, and custom tables. Once mastered, DAX gives you powerful control over visuals and reports, allowing for better performance and more flexibility. This course covers the core concepts such as row query and filter context, with exercises focusing on filtering, counting, ranking, and iterating functions.

- 1
### Setting up Data Models with DAX

**Free**In this chapter, you'll write custom functions to create new tables and calculated columns.

- 2
### DAX and Measures

**Free**In this chapter, you'll write custom functions to create calculated measures. You'll also get introduced to variables to make writing DAX functions more efficient.

- 3
### Filtering and Counting with DAX

Expand your DAX power with some commonly used DAX measures. This chapter focuses on filtering and counting functions.

- 4
### Iterating Functions

This chapter covers the core concept of another powerful set of DAX functions, the so called iterating functions. You will explore iterations with exercises focusing on ranking and iterating your data.

In the following tracks

Data AnalystCollaborators

#### Maarten Van den Broeck

Senior Content Developer at DataCamp

Maarten is an aquatic ecologist and teacher by training and a data scientist by profession. He is also a certified Power BI and Tableau data analyst. After his career as a PhD researcher at KU Leuven, he wished that he had discovered DataCamp sooner. He loves to combine education and data science to develop DataCamp courses. In his spare time, he runs a symphonic orchestra.

#### Carl Rosseel

Head of BI Curriculum at DataCamp

Carl, a Tableau certified data analyst, is the head of the BI Curriculum at DataCamp, where he focuses on democratizing data skills through Business Intelligence tools. He holds a double master's degree in Business Engineering and worked in various analyst roles at an e-commerce company before joining DataCamp. He likes to use data to make the complex simple and tell data stories. Outside work, you can often find him enjoying a game of soccer, both on and off the pitch.

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