Top 20 Interview Questions with Answers for Power BI

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1. What is a workspace in Power BI?
   Answer: A workspace in Power BI is a container for reports, dashboards, and other artifacts that are related to a specific project or team.
2. How do you share a report in Power BI?
   Answer: To share a report in Power BI, you can publish it to a workspace and grant access to specific users or groups.
3. What is the difference between a report and a dashboard in Power BI? Answer: A report in Power BI is a collection of visualizations and data analysis tools, while a dashboard is a summary of key performance indicators (KPIs) that are presented in a single view.
4. What is Power Query in Power BI?
   Answer: Power Query is a data transformation and cleaning tool in Power BI that allows users to extract data from multiple sources, transform and clean the data, and load it into Power BI.
5. What is the M language in Power Query?
   Answer: The M language is a functional programming language used in Power Query to create custom transformations and data-cleaning operations.
6. How do you connect to a data source using Power Query?
   Answer: To connect to a data source using Power Query, you can use the Get Data feature and select the data source from the list of available connectors.
7. What is the difference between DirectQuery and Import mode in Power BI?
   Answer: In Import mode, data is loaded into Power BI and stored in memory for fast querying and analysis. In DirectQuery mode, data remains in the source system and is queried in real-time by Power BI.
8. What is Power BI Report Server?
   Answer: Power BI Report Server is an on-premises reporting solution that allows organizations to host and manage Power BI reports and dashboards on their own servers.
9. What is the difference between Power BI Service and Power BI Report Server?
   Answer: Power BI Service is a cloud-based service that allows users to share and collaborate on Power BI reports and dashboards, while Power BI Report Server is an on-premises reporting solution that allows organizations to host and manage Power BI reports and dashboards on their own servers.
10. What is Power BI Embedded?
    Answer: Power BI Embedded is a service that allows developers to embed Power BI reports and dashboards in their own applications and websites.
11. What is Power BI Premium?
    Answer: Power BI Premium is a licensing option that provides enhanced performance, scalability, and security features for large organizations that require advanced analytics capabilities.
12. What is a data gateway in Power BI?
    Answer: A data gateway is a software component that allows Power BI to connect to on-premises data sources, such as SQL Server or Oracle.
13. How do you create a calculated field in Power BI?
    Answer: To create a calculated field in Power BI, you can use the formula bar or the Data Analysis Expressions (DAX) language.
14. What is Power View in Power BI?
    Answer: Power View is a data visualization tool in Power BI that allows users to create interactive charts, maps, and other visualizations.
15. What is a drill-across in Power BI?
    Answer: A drill-across is a feature in Power BI that allows users to navigate between two or more reports by clicking on a data point.
16. What is a custom visual in Power BI?
    Answer: A custom visual is a visualization created by a third-party developer that extends the built-in visualizations in Power BI.
17. How do you create a custom visual in Power BI?
    Answer: To create a custom visual in Power BI, you can use the Power BI developer tools, which include the Power BI Visuals SDK and Visual Studio. You can also create custom visuals using other programming languages such as JavaScript and D3.js.
18. What is the Power BI REST API?
    Answer: The Power BI REST API is a programming interface that allows developers to programmatically access and interact with Power BI data, reports, and dashboards.
19. What is the difference between a measure and a calculated column in Power BI?
    Answer: A measure is a calculation that is performed on the fly, based on the current filter context, while a calculated column is a static calculation that is performed when the data is loaded into Power BI.
20. How do you optimize performance in Power BI?
    Answer: To optimize performance in Power BI, you can use techniques such as data modeling, query optimization, and performance tuning.

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