Look for a gray bar at the bottom of the join diagram that spans its entire width.
It will offer you help without getting in the way. If your data types and column lengths seem to not make sense or you seem to have multi-level headers as in the example below, It will do a first pass through the data as it loads to populate the preview grid and run a light-weight version of the interpreter to see if spreadsheet contains anything that it can fix. If your spreadsheets are perfectly clean, you probably won’t even notice it is there. If you’re used to dealing with messy Excel spreadsheets, first thing you’ll notice is the “data interpreter”. In my first post of “What’s New?” series for Tableau 9.0, I will start with Data Preparation. Tableau 9.0 is loaded with features that will make it much easier to get your data ready for analysis.
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