Introduction
Power BI is one of the most in-demand skills in 2025.
Everyday thousands of people search for Power BI interview questions before interviews.
Basic Power BI Interview Questions (Freshers)
1. What is Power BI?
Power BI is a business intelligence tool by Microsoft used to analyze data and create interactive dashboards and reports.
2. What are the main components of Power BI?
- Power BI Desktop
- Power BI Service
- Power BI Mobile App
- Power BI Gateway
3. What is a Power BI Dashboard?
A dashboard is a single-page view that shows key metrics using visuals pulled from one or more reports.
4. Difference between Dashboard and Report?
| Dashboard | Report |
|---|---|
| Single page | Multiple pages |
| Created in Service | Created in Desktop |
| Read-only | Interactive |
5. What is Power Query?
Power Query is used for:
Data cleaning
Data transformation
Data shaping before loading into Power BI
Intermediate Power BI Interview Questions
6. What is DAX?
DAX (Data Analysis Expressions) is a formula language used to create measures, calculated columns, and tables.
7. Difference between Calculated Column and Measure?
- Calculated Column → Stored in memory
- Measure → Calculated at runtime (faster & better)
8. What is Star Schema?
Star schema is a data model where:
Fact table is in the center
Dimension tables surround it
It improves performance and simplifies DAX.
9. What is Row-Level Security (RLS)?
RLS restricts data access for users based on roles and filters using DAX.
10. What is a Date Table and why is it important?
A Date Table is required for:
Time intelligence
YoY, MoM, YTD calculations
Advanced Power BI Interview Questions (Experienced)
11. What is Context in DAX?
- Row Context
- Filter Context
Context controls how DAX calculations behave.
12. Difference between ALL and ALLSELECTED?
ALL → Removes all filters
ALLSELECTED → Keeps user-applied filters
13. What is Incremental Refresh?
Incremental Refresh updates only new or modified data instead of full dataset refresh.
14. What is Composite Model?
Composite model allows:
- Import + DirectQuery together
- Real-time + historical data
15. How do you optimize Power BI performance?
- Use star schema
- Reduce columns
- Optimize DAX
- Limit visuals
- Use incremental refresh
Real Interview Scenario Questions
16. How do you handle large datasets in Power BI?
- Incremental refresh
- Aggregations
- Proper indexing
- Optimized data model
17. Can multiple users see different data in one report?
Yes, using Dynamic RLS.
8. How do you secure Power BI data?
- Workspace access
- RLS
- App sharing
- Sensitivity labels
Most Asked HR Question
19. Why should we hire you as a Power BI Developer?
Because I can:
- Understand business requirements
- Build optimized models
- Write efficient DAX
- Create user-friendly dashboards
- Ensure data security
Tips to Crack Power BI Interview
- Focus on DAX basics
- Practice modeling
- Explain concepts with examples
- Know performance tuning
- Be clear about real projects
Conclusion
Power BI interviews in 2025 focus on practical knowledge, not theory.
If you understand concepts shared in this blog, you are interview-ready.
👉 Bookmark this page and revise before interviews.
