I think we can all agree, Tableau looks great in a demo with the sample data stored in Excel. But the true test of a self-service analytics tool is working with real data that may reside in more than a single Excel workbook. Thankfully, Tableau has two different methods of combining data to give the user flexibility: data joining and data blending. I want to address a few potential misunderstandings and highlight a few caveats to keep in mind when using either method. READ MORE.