#### Overview of this book

The Tableau Certified Data Analyst certification validates the essential skills needed to explore, analyze, and present data, propelling your career in data analytics. Whether you're a seasoned Tableau user or just starting out, this comprehensive resource is your roadmap to mastering Tableau and achieving certification success. The book begins by exploring the fundamentals of data analysis, from connecting to various data sources to transforming and cleaning data for meaningful insights. With practical exercises and realistic mock exams, you'll gain hands-on experience that reinforces your understanding of Tableau concepts and prepares you for the challenges of the certification exam. As you progress, expert guidance and clear explanations make it easy to navigate complex topics as each chapter builds upon the last, providing a seamless learning experience—from creating impactful visualizations to managing content on Tableau Cloud. Written by a team of experts, this Tableau book not only helps you pass the certification exam but also equips you with the skills and confidence needed to excel in your career. It is an indispensable resource for unlocking the full potential of Tableau.
Chapter 2: Transforming Data
Chapter 3: Calculations
Chapter 4: Grouping and Filtering
Chapter 5: Charts
Chapter 6: Dashboards
Chapter 7: Formatting
Chapter 8: Publishing and Managing Content
Chapter 9: Accessing the Online Practice Resources
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# Boolean Calculated Fields

Tableau’s calculated fields can be configured to give a true or false result using a variety of boolean functions, such as is a given value a date?, is a given value a null?, and so on. The boolean-type logic can also be expanded into longer-form statements with multiple conditions and more possible outputs than true or false. These logical statements can take the form of either `IF` or `CASE` statements.

Boolean or logical calculated field functions could be used in the orders example data source from the introduction to implement logic that flags orders over a specific total sales value. The `ISNULL` function could also be used to filter out any null orders that have entered the data source by accident.

## Boolean Functions

There are a variety of Boolean functions available in Tableau’s calculated fields that return `TRUE` or `FALSE` based on the results of a specific test.

The `ISNULL` function returns `TRUE` if the value input is `null` and `FALSE...`