🧠 Top 30 Power BI Interview Questions with Answers
Power BI has become a powerful tool in modern data analytics. Whether you are a beginner or moving toward intermediate level, preparing these questions will strengthen your foundation and confidence.
🔹 Beginner Level Power BI Questions
1. What is Power BI?
Power BI is a business analytics tool by Microsoft used to visualize data, create dashboards, and share insights.
2. What are the main components of Power BI?
- Power BI Desktop
- Power BI Service
- Power BI Mobile
3. What is Power BI Desktop?
It is a free application used to create reports and data models.
4. What is Power BI Service?
An online cloud service to publish and share reports.
5. What is a dashboard?
A dashboard is a single-page view showing key metrics using visuals.
6. What is a report?
A report contains multiple pages of visualizations based on a dataset.
7. What is a dataset?
A dataset is a collection of data used to create reports and dashboards.
8. What is Power Query?
Power Query is used to clean, transform, and load data.
9. What is DAX?
DAX (Data Analysis Expressions) is a formula language used in Power BI.
10. What are visuals in Power BI?
Charts, graphs, maps, and tables used to represent data visually.
🔹 Intermediate Level Questions
11. What is a slicer?
A slicer is a visual filter used to filter data interactively.
12. Difference between filter and slicer?
- Filter: Works in background
- Slicer: Visible on report for user interaction
13. What is data modeling?
Connecting multiple tables using relationships.
14. What are relationships in Power BI?
Connections between tables using keys (one-to-many, many-to-many).
15. What is a calculated column?
A new column created using DAX formula.
16. What is a measure?
A calculation performed on data (like SUM, COUNT).
17. Difference between calculated column and measure?
- Column: Stored in table
- Measure: Calculated dynamically
18. What is cardinality?
Defines relationship type (one-to-one, one-to-many).
19. What is Power BI Gateway?
Used to connect on-premise data to Power BI Service.
20. What is refresh in Power BI?
Updating data from source.
🔹 Practical & Interview-Focused Questions
21. What is drill-down in Power BI?
Allows users to go deeper into data hierarchy.
22. What is drill-through?
Navigate to another report page with filtered data.
23. What is KPI in Power BI?
Key Performance Indicator showing progress toward a goal.
24. What is row-level security (RLS)?
Restricts data access for different users.
25. What is star schema?
A data model with fact table and dimension tables.
26. What is snowflake schema?
A normalized version of star schema.
27. What are bookmarks?
Used to save report view and navigation state.
28. What is conditional formatting?
Changing visual appearance based on data values.
29. What is DirectQuery?
Connects to live data without importing.
30. What is Import mode?
Data is loaded into Power BI for faster performance.
🎯 Conclusion
Power BI interviews test both conceptual understanding and practical knowledge. If you regularly practice creating dashboards, using DAX, and working with real datasets, you will naturally perform well.
Consistency, just like traditional learning methods, builds mastery step by step.
