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Book Overview & Buying
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Table Of Contents
Mastering Tableau 2026 - Fifth Edition
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Isn't a data blend the same thing as a left join? This is a question that new Tableau authors often ask. The answer, of course, is no, but let us explore the differences. The following example is simple, even lighthearted, but does demonstrate profound consequences that can result from incorrect aggregation resulting from an erroneous join.
We will explore in which order aggregation happens in Tableau. This will help you understand how to use blends and joins more effectively.
For this example, we will use the following data:
Figure 4.15: Pants and shirts sales
In these tables, two people are listed: Tanya and Zhang. In one table, these people are members of the Salesperson dimension, and in the other, they are members of the Sales Associate dimension. Furthermore, Tanya and Zhang both sold $200 in pants and $100 in shirts. Let us explore new ways Tableau could connect to this data to better understand joining and data blending.
When you look at...