POWER BI Interview with Questions and Correct Answers 2024 (100%Solved).

POWER BI Interview with Questions and Correct Answers 2024 (100%Solved). 1. What is Power BI and what are its key components? Answer: Power BI is a business analytics tool by Microsoft used for data visualization and sharing insights across an organization. Its key components include Power Query (for data extraction and transformation), Power Pivot (for data modeling), Power View (for interactive visualizations), and Power Map (for geographical data visualization). 2. How does Power BI differ from Excel for data analysis? Answer: While Excel is a general-purpose spreadsheet tool, Power BI is specifically designed for business intelligence and data visualization. Power BI can handle much larger datasets, provides more advanced visualizations, and offers better integration with various data sources. It also allows for real-time collaboration and sharing of reports. 3. What is a data model in Power BI? Answer: A data model in Power BI defines the relationships between different data tables imported into the tool. It includes tables, columns, relationships, calculations, and hierarchies. The data model forms the backbone of Power BI reports and enables users to create meaningful visualizations and perform analysis across related datasets. 4. How do you import data into Power BI? Answer: Data can be imported into Power BI from various sources including Excel files, databases (such as SQL Server, MySQL), online services (like Salesforce, Google Analytics), and cloud platforms (such as Azure Blob Storage). Power BI provides a user-friendly interface to connect to these sources and import data using Power Query. 5. What is DAX and how is it used in Power BI? Answer: DAX (Data Analysis Expressions) is a formula language used in Power BI to create calculated columns and measures. It allows users to perform calculations, define custom metrics, and manipulate data within Power BI reports. DAX functions are similar to Excel functions but are optimized for working with large datasets. 6. What is the difference between calculated columns and measures in Power BI? Answer: Calculated columns are columns created within a table in Power BI using DAX expressions. They are computed row by row during data refresh. Measures, on the other hand, are dynamic aggregations or calculations based on the data model. They are typically used in visualizations to perform calculations on the fly. 7. How can you create interactive reports in Power BI? Answer: Power BI provides various tools to create interactive reports. Users can create slicers, which are visual filters that allow users to interactively filter data. Drill-down and drill-through features enable users to explore data at different levels of detail. Additionally, bookmarks and buttons can create interactive navigation within reports. 8. What is Power Query and how does it facilitate data preparation in Power BI? Answer: Power Query is a data connectivity and preparation tool in Power BI used to extract, transform, and load (ETL) data from various sources. It allows users to connect to multiple data sources, perform data cleansing and transformation operations, and combine data from different sources before loading it into the data model. 9. How can you share Power BI reports with others? Answer: Power BI reports can be shared with others through various methods. Users can publish reports to the Power BI service and share them with specific individuals or groups within their organization. Reports can also be embedded into websites or SharePoint Online pages. Additionally, Power BI allows for exporting reports to different formats such as PDF or PowerPoint for offline sharing. 10. What is the difference between Power BI Desktop and Power BI Service? Answer: Power BI Desktop is a free standalone application to create and publish Power BI reports locally on a user's computer. Power BI Service (Power BI Online) is a cloud-based platform where users can publish, share, and collaborate on Power BI reports with others. While Power BI Desktop is used for report authoring, Power BI Service is used for report consumption and sharing. 11. How does Power BI integrate with other Microsoft products and services? Answer: Power BI integrates seamlessly with other Microsoft products and services such as Excel, SharePoint, Teams, and Dynamics 365. Users can embed Power BI reports into SharePoint Online pages, collaborate on reports within Microsoft Teams, and analyze data from Dynamics 365 directly within Power BI. 12. What are the different deployment options available for Power BI? Answer: Power BI offers multiple deployment options to meet different business needs. These include Power BI Desktop for authoring reports locally, Power BI Service for cloud-based report sharing and collaboration, and Power BI Report Server for on-premises report deployment within an organization's infrastructure. 13. How can you schedule data refresh in Power BI Service? Answer: In Power BI Service, users can schedule data refresh for their datasets to ensure that reports always reflect the latest data. This can be done by configuring a refresh schedule within the dataset settings, specifying the frequency and time of refresh, and providing credentials for data source authentication. 14. What is the role of Power BI Gateway in Power BI architecture? Answer: Power BI Gateway acts as a bridge between on-premises data sources and Power BI Service in the cloud. It enables secure data transfer and communication between Power BI Service and on-premises data sources, allowing users to access and refresh data stored in on-premises databases or files. 15. How can you enhance the visual appeal of Power BI reports? Answer: Power BI offers various features to enhance the visual appeal of reports. Users can customize colors, fonts, and backgrounds to match corporate branding. They can also use custom visuals from the Power BI marketplace or create their custom visuals using the Power BI Visualizations SDK.