Book Image

Tableau Desktop Specialist Certification

By : Adam Mico
Book Image

Tableau Desktop Specialist Certification

By: Adam Mico

Overview of this book

The Tableau Desktop Specialist certification is fundamental for any data visualization professional who works in the field with Tableau. This book gets you started by covering the exam format, Tableau basics, and best practices for preparing data for analysis and visualization. It also builds on your knowledge of advanced Tableau topics to get you up to speed with the essential domains and domain objectives. Although the guide provides an outline and starting point to key in on what needs to be understood before the examination, it also delivers in context to give you a strong understanding of each piece before taking the exam. Instructions on how to get hands on with examples, a common data source, and suggested elements are also included. Understanding the concepts will not only assist you in passing the examination, but will also help you work effectively with the tool in your workspace. By the end of this book, you'll be able to efficiently prepare for the certification exam with the help of mock tests, detailed explanations, and expert advice from the author.
Table of Contents (17 chapters)
1
Part 1: Introduction to Tableau
7
Part 2: Mastering the Exam
12
Part 3: The Final Prep

Unions in Tableau Desktop and join basics

In the following sections, you will learn the basics of unions, how to perform a union in Tableau, and learn the basics of joins. Unions will be focused on more as they are part of the examination, whereas joins are covered much more lightly.

Unions

Unions are added when you have two or more tables with the same fields or columns. All the user is doing is adding to the data (or appending it). In the real world, data can come in piecemeal, meaning that you get packets of data not already aligned to a table. In many instances, it is the Tableau developer’s responsibility to structure it well for visualization. Figure 6.22 will show how it works:

Figure 6.22: Union configuration

Figure 6.22: Union configuration

Figure 6.22 shows that Table 1 and Table 2 have the same fields (Date, Sales State, and Sales Amount, with data in the same format. Although both tables contain three rows, the number of rows does not matter. What matters is that...