BigData / Tableau Interview Questions
What is a dual-axis chart, and how do you create one?
A dual-axis chart overlays two measures on the same view, each with its own independent Y-axis, so you can compare two metrics with different scales side by side in one chart rather than two separate ones.
Columns: [Order Date] (by month) Rows: SUM([Sales]) SUM([Profit]) -- drag onto the same Rows shelf area -> right-click the second measure's axis -> "Dual Axis"
- Place the first measure on the Rows shelf as usual.
- Drag the second measure onto the Rows shelf, next to (not replacing) the first — this initially creates two separate stacked panes.
- Right-click the axis for the second measure and choose Dual Axis to merge them into one shared plot area with two Y-axes.
- Optionally right-click one axis and choose Synchronize Axis if you want both measures to share the same scale instead of independent ones.
A classic use case is plotting Sales as bars and Profit Ratio as a line on the same timeline — each keeps its own natural scale, but both appear together so trends and relationships between the two metrics are easy to spot.
What does a dual-axis chart let you do that a single-axis chart cannot?
What menu option merges two stacked measure panes into one dual-axis view?
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