PowerBI INTERVIEW QUESTIONS and ANSWERS
Beginner Level
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What is Power BI?
- Answer: Power BI is a cloud-based business intelligence and data visualization tool developed by Microsoft. It allows users to connect to various data sources, transform and analyze data, create interactive dashboards and reports, and share insights with others.
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What are the advantages of Power BI?
- Answer: Some advantages include:
- User-friendly interface
- Powerful data transformation and modeling tools
- Real-time dashboard updates
- Integration with various data sources
- Strong community support and regular updates
- Answer: Some advantages include:
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What are the main components of Power BI?
- Answer: The main components are:
- Power BI Desktop
- Power BI Service (Cloud-based)
- Power BI Mobile Apps
- Answer: The main components are:
Intermediate Level
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What is DAX in Power BI?
- Answer: DAX (Data Analysis Expressions) is a formula language used in Power BI for creating custom calculations and aggregations on data models.
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What are Power BI Custom Visuals?
- Answer: Custom visuals are additional visualizations created by developers that can be imported into Power BI to extend its visualization capabilities beyond the default visuals.
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What is Power Query?
- Answer: Power Query is a data connection technology that enables you to discover, connect, combine, and refine data across a wide variety of sources.
Advanced Level
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How do you implement row-level security in Power BI?
- Answer: Row-level security (RLS) can be implemented by defining roles and rules within Power BI Desktop. These roles can then be assigned to users in the Power BI Service to restrict data access based on the defined rules.
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What is the difference between Power BI and Tableau?
- Answer: While both are powerful BI tools, Power BI is generally more cost-effective and integrates well with Microsoft products. Tableau, on the other hand, is known for its robust data visualization capabilities and flexibility with various data sources.
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How can you optimize the performance of a Power BI report?
- Answer: Performance can be optimized by
- Reducing the number of visuals on a report page
- Using aggregations and summarizations
- Optimizing data models and relationships
- Using DirectQuery for large datasets
- Answer: Performance can be optimized by
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