Commonly Asked 30 Power BI Interview Questions with Answers
1. What is the Power BI Gateway, and when should it be used? A tool enabling secure data transfer between on-premises data sources and Power BI Service; used for DirectQuery or scheduled refresh.
2. How to publish a report from Power BI Desktop to Power BI Service? Save the report → Click "Publish" → Choose workspace.
3. How can data refresh be scheduled in Power BI Service? Set refresh schedule in dataset settings after configuring gateway.
4. Key differences between DirectQuery and Import modes? DirectQuery: Real-time data, slower visuals. Import: Cached data, faster performance.
5. How do you approach data modeling in Power BI? Use star schema, create relationships, optimize measures, and ensure data integrity.
6. Explain the star and snowflake schema. Star Schema: Central fact table connected to dimension tables. Snowflake Schema: Dimension tables are normalized.
7. Types of visuals in Power BI and selecting the best one? Bar, line, pie, map, table, etc.; choose based on data type and insights needed.
8. Role of drill through and drilldown in reports? Drill Through: Navigate to detailed pages. Drilldown: View hierarchical data within the same visual.
10. What is the Q&A feature in Power BI? AI-powered tool to query data using natural language.
11. Sharing reports with non-licensed users? Use Power BI Premium or export reports to PDF/PPT.
12. Function of Power BI REST API? Automates workflows, manages reports/dashboards programmatically.
13. How are bookmarks used? Save report views for navigation or storytelling.
14. Strategies to optimize report performance? Use aggregations, reduce visuals, minimize calculated columns.
15. Handling large datasets and optimization? Enable incremental refresh, use DirectQuery, optimize DAX.
16. What are DAX functions, and how are they used? Expressions for calculations and queries in Power BI.
20. How to create a calculated column? Use DAX in Power BI Desktop's data view.
21. Explain relationships and their creation. Define table connections using primary and foreign keys.
23. How is the Filter Pane used? Apply filters at visual, page, or report level.
24. Purpose of Power BI Service App Workspaces? Collaborate, manage reports/dashboards, and share content.
25. Row-level security (RLS) implementation? Define roles and DAX filters to restrict data access.
26. Difference between a Power BI Dashboard and Report? Dashboard: Single-page summary. Report: Multi-page interactive insights.
27. Best practices for designing dashboards? Keep visuals simple, focus on KPIs, use themes.
29. Role of dataflows? Reusable ETL processes in Power BI Service.
30. Parameters in Power BI and their benefits? Dynamic inputs for queries, enhance flexibility.
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Commonly Asked 30 Power BI Interview Questions with Answers
1. What is the Power BI Gateway, and when should it be used?
A tool enabling secure data transfer between on-premises data sources and Power BI Service; used for DirectQuery or scheduled refresh.
2. How to publish a report from Power BI Desktop to Power BI Service?
Save the report → Click "Publish" → Choose workspace.
3. How can data refresh be scheduled in Power BI Service?
Set refresh schedule in dataset settings after configuring gateway.
4. Key differences between DirectQuery and Import modes?
DirectQuery: Real-time data, slower visuals.
Import: Cached data, faster performance.
5. How do you approach data modeling in Power BI?
Use star schema, create relationships, optimize measures, and ensure data integrity.
6. Explain the star and snowflake schema.
Star Schema: Central fact table connected to dimension tables.
Snowflake Schema: Dimension tables are normalized.
7. Types of visuals in Power BI and selecting the best one?
Bar, line, pie, map, table, etc.; choose based on data type and insights needed.
8. Role of drill through and drilldown in reports?
Drill Through: Navigate to detailed pages.
Drilldown: View hierarchical data within the same visual.
10. What is the Q&A feature in Power BI?
AI-powered tool to query data using natural language.
11. Sharing reports with non-licensed users?
Use Power BI Premium or export reports to PDF/PPT.
12. Function of Power BI REST API?
Automates workflows, manages reports/dashboards programmatically.
13. How are bookmarks used?
Save report views for navigation or storytelling.
14. Strategies to optimize report performance?
Use aggregations, reduce visuals, minimize calculated columns.
15. Handling large datasets and optimization?
Enable incremental refresh, use DirectQuery, optimize DAX.
16. What are DAX functions, and how are they used?
Expressions for calculations and queries in Power BI.
20. How to create a calculated column?
Use DAX in Power BI Desktop's data view.
21. Explain relationships and their creation.
Define table connections using primary and foreign keys.
23. How is the Filter Pane used?
Apply filters at visual, page, or report level.
24. Purpose of Power BI Service App Workspaces?
Collaborate, manage reports/dashboards, and share content.
25. Row-level security (RLS) implementation?
Define roles and DAX filters to restrict data access.
26. Difference between a Power BI Dashboard and Report?
Dashboard: Single-page summary.
Report: Multi-page interactive insights.
27. Best practices for designing dashboards?
Keep visuals simple, focus on KPIs, use themes.
29. Role of dataflows?
Reusable ETL processes in Power BI Service.
30. Parameters in Power BI and their benefits?
Dynamic inputs for queries, enhance flexibility.
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