BigData / Tableau Interview Questions
What is a Gantt chart, and when would you use one in Tableau?
A Gantt chart plots bars along a timeline to show the duration and sequence of discrete tasks or events, making it the natural choice whenever "how long did this take, and when" is the question.
Columns: [Start Date] (continuous) Rows: [Task Name] Marks: Gantt Bar, Size = [Duration]
- The Gantt Bar mark type sets each bar's starting position based on a date field on Columns.
- The bar's length is controlled by dragging a duration measure (e.g. days to complete) onto the Size property of the Marks card.
- Rows typically hold the task, project phase, or resource name, so each row shows one continuous bar (or a broken series of bars for recurring tasks).
Common use cases include project timelines (task start/end dates), employee scheduling (shift start/duration), and equipment usage logs — anywhere the core story is "this thing was active from this point for this long," which a Gantt chart shows more intuitively than a plain table of start and end dates ever could.
What Marks card property controls the length of a Gantt bar?
What type of question is a Gantt chart best suited to answer?
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