For this example, I created an Excel file with two sheets to Union.
If you want to reproduce the example, you can download the Union example file from my website, book.ladataviz.com, in the section Chapter 4: Connect To Data and Simple Transformation section, or use this direct link: https://ladataviz.com/wp-content/uploads/2018/09/Union-example.xlsx.
The Union example Excel file contains two sheets:
- One named 2017, which contains the data shown in the following screenshot:
- One named 2018, with the data shown in the following screenshot:
As you can see, the two sheets have the same column name. In Tableau, after connecting ...
