BigData / Tableau Interview Questions
What is Tableau Prep?
Tableau Prep is a visual, drag-and-drop tool for cleaning, reshaping, and combining data before it ever reaches a Tableau Desktop workbook, aimed at the "data wrangling" step of analytics.
- You build a flow: a visual pipeline of steps like cleaning, filtering, splitting fields, pivoting, aggregating, and joining or unioning multiple data sources.
- Each step shows a live preview of the data as it's transformed, so you can catch mistakes immediately instead of at the end of a long script.
- Finished flows can output a cleaned data extract, or be scheduled to run automatically (via Tableau Prep Conductor on Server/Cloud) to keep downstream dashboards fresh.
Raw CSV -> Clean step (trim/rename fields) -> Join with lookup table -> Pivot -> Output as .hyper extract
Prep complements Desktop rather than replacing it: Prep handles the "get the data into good shape" work, while Desktop handles the "explore and visualize" work, and the two are commonly used together in the same project.
What is the visual pipeline of transformation steps in Tableau Prep called?
What feature lets a Tableau Prep flow run automatically on a schedule?
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