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Tableau 8: The Official Guide by George Peck

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3
CHAPTER
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Data Connection Details
As discussed in Chapter 2, the very first requirement when creating a new Tableau workbook is choosing a data source. Unlike traditional spreadsheet and word processing programs, Tableau can’t start with a “blank slate”; it must connect to some existing database, data file, or data source before you can begin to design a chart or graph. Tableau’s entire paradigm is visualizing data—the first thing you have to do is pick the data!
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Note   Open the Chapter 3 - Data Connections-Groups-Sets-Blending.twbx file in Tableau ...

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