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Most Asked Power BI Interview Questions


Power BI Interview Questions

Power BI Basics

1. What are the key features of Power BI?
2. Explain the difference between Power BI Desktop, Power BI Service, and Power BI Mobile.
3. What are the different data connectivity modes in Power BI (Import, DirectQuery, Live Connection)?
4. How do you handle row-level security (RLS) in Power BI?

Data Modeling

5. How do you create relationships between tables in Power BI?
6. What is the difference between a star schema and a snowflake schema? When do you use each?
7. Explain the importance of surrogate keys in data modelling.
8. How do you handle circular relationships in Power BI?
9. What are calculated columns and measures? How are they different?

DAX (Data Analysis Expressions)

10. Write a DAX formula to calculate year-to-date (YTD) sales.
11. What is the difference between the SUM, SUMX, and CALCULATE functions?
12. How do you use the FILTER function in DAX? Provide an example.
13. Explain the concept of context in DAX (row context and filter context).
14. Write a DAX formula to calculate the running total for sales.

Power Query and Data Transformation

15. How do you handle missing or inconsistent data in Power Query?
16. Explain the concept of M language in Power Query.
17. How do you split columns or merge tables in Power Query?
18. What is the difference between appending and merging queries in Power Query?

Data Visualization

19. How do you choose the right type of visualization for your data?
20. What are slicers, and how do you use them in Power BI dashboards?
21. Explain the use of bookmarks in Power BI.
22. How do you create a drill-through page in Power BI?
23. What are custom visuals, and how do you import them into Power BI?

Performance Optimization

24. How do you optimize Power BI reports for performance?
25. What are the best practices for reducing report size in Power BI?
26. How do you handle large datasets in Power BI using DirectQuery?
27. Explain the use of aggregations to improve performance in Power BI.

SQL and Database Integration

28. How do you write SQL queries to fetch data for Power BI reports?
29. How would you join multiple tables in SQL for Power BI reporting?
30. What is the difference between INNER JOIN and LEFT JOIN? Provide an example.
31. Write an SQL query to find the top 5 customers by sales.

Scenario-Based Questions

32. Describe a scenario where you implemented row-level security for a client.
33. Share an example of a challenging Power BI project you worked on and how you resolved the issue.
34. How do you handle real-time data updates in Power BI dashboards?
35. What steps do you take to debug incorrect data in Power BI reports?



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