Top 10 Power BI interview questions with answers:
1. What are the key components of Power BI?
Solution:
Power Query: Data transformation and preparation.
Power Pivot: Data modeling.
Power View: Data visualization.
Power BI Service: Cloud-based sharing and collaboration.
Power BI Mobile: Mobile reports and dashboards.
2. What is DAX in Power BI?
Solution:
DAX (Data Analysis Expressions) is a formula language used in Power BI to create calculated columns, measures, and tables.
Example:
TotalSales = SUM(Sales[Amount])
3. What is the difference between a calculated column and a measure?
Solution:
Calculated Column: Computed row by row in the data model.
Measure: Computed at the aggregate level based on filters in a visualization.
4. How do you connect Power BI to a database?
Solution:
1. Open Power BI Desktop.
2. Go to Home > Get Data > Database (e.g., SQL Server).
3. Enter server and database details, then load or transform data.
5. What is the role of relationships in Power BI?
Solution:
Relationships define how tables in a data model are connected. Power BI uses relationships to filter and calculate data across multiple tables.
6. What are slicers in Power BI?
Solution:
Slicers are visual filters that allow users to interactively filter data in reports.
Example: A slicer for "Region" lets users view data specific to a selected region.
7. How do you implement Row-Level Security (RLS) in Power BI?
Solution:
1. Define roles in Modeling > Manage Roles.
2. Use DAX expressions to restrict data (e.g., [Region] = "North").
3. Assign roles to users in the Power BI Service.
8. What are the different types of joins in Power BI?
Solution:
Power BI offers the following join types in Power Query:
Inner Join
Left Outer Join
Right Outer Join
Full Outer Join
Anti Join (Left/Right Exclusion)
9. What is the difference between Power BI Pro and Power BI Premium?
Solution:
Power BI Pro: Allows sharing and collaboration for individual users.
Power BI Premium: Provides dedicated resources, larger dataset sizes, and supports enterprise-level usage.
10. How can you optimize Power BI reports for performance?
Solution:
- Use summarized datasets.
- Reduce visuals on a single page.
- Optimize DAX expressions.
- Enable aggregations for large datasets.
- Use query folding in Power Query.
Share with credits: https://t.me/sqlspecialist
Hope it helps :)
1. What are the key components of Power BI?
Solution:
Power Query: Data transformation and preparation.
Power Pivot: Data modeling.
Power View: Data visualization.
Power BI Service: Cloud-based sharing and collaboration.
Power BI Mobile: Mobile reports and dashboards.
2. What is DAX in Power BI?
Solution:
DAX (Data Analysis Expressions) is a formula language used in Power BI to create calculated columns, measures, and tables.
Example:
TotalSales = SUM(Sales[Amount])
3. What is the difference between a calculated column and a measure?
Solution:
Calculated Column: Computed row by row in the data model.
Measure: Computed at the aggregate level based on filters in a visualization.
4. How do you connect Power BI to a database?
Solution:
1. Open Power BI Desktop.
2. Go to Home > Get Data > Database (e.g., SQL Server).
3. Enter server and database details, then load or transform data.
5. What is the role of relationships in Power BI?
Solution:
Relationships define how tables in a data model are connected. Power BI uses relationships to filter and calculate data across multiple tables.
6. What are slicers in Power BI?
Solution:
Slicers are visual filters that allow users to interactively filter data in reports.
Example: A slicer for "Region" lets users view data specific to a selected region.
7. How do you implement Row-Level Security (RLS) in Power BI?
Solution:
1. Define roles in Modeling > Manage Roles.
2. Use DAX expressions to restrict data (e.g., [Region] = "North").
3. Assign roles to users in the Power BI Service.
8. What are the different types of joins in Power BI?
Solution:
Power BI offers the following join types in Power Query:
Inner Join
Left Outer Join
Right Outer Join
Full Outer Join
Anti Join (Left/Right Exclusion)
9. What is the difference between Power BI Pro and Power BI Premium?
Solution:
Power BI Pro: Allows sharing and collaboration for individual users.
Power BI Premium: Provides dedicated resources, larger dataset sizes, and supports enterprise-level usage.
10. How can you optimize Power BI reports for performance?
Solution:
- Use summarized datasets.
- Reduce visuals on a single page.
- Optimize DAX expressions.
- Enable aggregations for large datasets.
- Use query folding in Power Query.
Share with credits: https://t.me/sqlspecialist
Hope it helps :)