BigData / Tableau Interview Questions
What are filters in Tableau?
Filters restrict the data shown in a view, letting you narrow a worksheet down to only the rows relevant to the question you're asking, without changing the underlying data source.
- Filters can be applied to dimensions (e.g. only show Region = "West"), measures (e.g. only show Sales > 1000), or dates (e.g. only show the last 12 months).
- A filter can live on a single worksheet, or be added to a dashboard as a quick filter so viewers can change it interactively.
- Filters can also be added to the whole data source, applying everywhere that data source is used across a workbook.
Drag [Region] to the Filters shelf -> select "West", "East" -> only rows matching those regions appear in the view
Filters are foundational to almost every Tableau worksheet: they're what lets one dataset serve many different analytical questions, simply by changing what's included before the visualization is drawn.
What do filters change when applied to a worksheet?
What lets a dashboard viewer interactively change a filter's value?
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