Top Tableau Interview Questions Set-2 (21- 40)

 

21. Examples of Table Calcs?

Running Total, Percent of Total, Difference, Rank, Moving Avg.

22. What is SHOW ME in Tableau?

Auto chart suggestion tool.

23. What is a dashboard?

A collection of worksheets displayed together.

24. Difference between worksheet and dashboard?

Worksheet = single view.
Dashboard = multiple views.

25. What is a story?

Sequential set of dashboards for storytelling.

26. What are filters in Tableau?

Extract, Data Source, Context, Dimension, Measure, Table calc filters.

27. Order of operations in Tableau?

Extract → Data Source → Context → Dimension → Measure → Table Calc.

28. What is a dual axis chart?

Two measures on the same graph with synchronized axis.

29. What is blending vs. joining?

Joining happens on DB.
Blending happens on Tableau (left join behavior).

30. What is a hierarchy?

Drill down structure (e.g., Year → Quarter → Month → Day).

31. What is a bin?

Continuous values grouped into equal-sized buckets.

32. What is a set?

Dynamic grouping of data based on conditions.

33. What is clustering?

K-means algorithm to group similar points.

34. What is reference line?

A line that highlights a specific value on axis like avg, median.

35. What is a data extract file extension?

.hyper

36. What are actions in Tableau?

Filter action, Highlight action, URL action.

37. What is the use of Extract Refresh?

To update data in extracts from the source.

38. What are device designer layouts?

Different layouts for Desktop, Mobile, Tablet dashboards.

39. What is performance recording in Tableau?

Tool to analyze performance bottlenecks.

40. How to optimize performance in Tableau?

Use extracts, reduce filters, reduce mark count, optimize LODs, indexing on DB.

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Top Tableau Interview Questions Set-1 (1- 20)

 

1. What is Tableau?

A data visualization tool used to create interactive dashboards and reports.

2. What are the different Tableau products?

Desktop, Prep, Server, Online, Public, Reader.

3. Difference between Live connection and Extract?

• Live: Real-time data, slower.
• Extract: In-memory snapshot, faster.

4. What is a data source filter?

Filter applied at the data-source level before loading to Tableau.

5. What is context filter?

A primary filter that creates a subset of data for other filters. It creates a temporary table .

6. Difference between context filter and normal filter?

Context runs first, normal filters apply on top of context.

7. What is a dimension?

Categorical field (e.g., Name, Date, Region).

8. What is a measure?

Numeric field that can be aggregated.

9. What is the difference between discrete and continuous fields?

• Discrete (blue): Categories.
• Continuous (green): Numeric ranges.

10. What is a parameter?

A dynamic input value that users can change.

11. What is a calculated field?

Custom formula created in Tableau.

12. What is data blending?

Combining data from different sources using a left join (primary + secondary).

13. When do you use data blending?

When joining is not possible (different DBs, different levels of detail).

14. Types of joins in Tableau?

Inner, Left, Right, Full Outer.

15. What is LOD Expression?

Fixed, Include, Exclude — controls granularity of aggregation.

16. Explain FIXED LOD.

Aggregates independently of view-level dimensions.
Example: { FIXED Customer : SUM(Sales) }.

17. Explain INCLUDE LOD.

Adds dimensions to the view for aggregation.

18. Explain EXCLUDE LOD.

Removes dimensions from the view for aggregation.

19. Difference between LOD and Table Calculations?

LOD: Pre-aggregation at source.
Table Calc: Post-aggregation at visualization level.

20. What is a Table Calculation?

A calculation applied on the result set (e.g., Running Total, Rank).

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