Power Bi Interview Questions And Answers
Comprehensive Guide to Power BI Interview Questions and Answers
Power Bi Interview Questions And Answers
Power BI interview questions typically cover topics such as data visualization, data modeling, DAX functions, Power Query, and Power BI data sources. Some common questions might include explaining how to create calculated columns, differences between calculated columns and measures, how to create relationships between data tables, and how to optimize reports for performance. In preparing for a Power BI interview, it is important to have a strong understanding of these concepts and be able to demonstrate practical application through examples from past projects or experiences. Additionally, being familiar with Power BI best practices and staying updated on the latest features can also be beneficial.
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1 - What is Power BI and how is it useful? Power BI is a business analytics tool by Microsoft that allows users to create interactive visualizations and reports from their data. It helps in analyzing data, gaining insights, and making data driven decisions.
2) Can you explain the difference between Power BI Desktop and Power BI Service? Power BI Desktop is a desktop application that allows users to create reports and dashboards locally on their computer, while Power BI Service is a cloud based service that allows users to publish, share, and collaborate on reports online.
3) How do you import data in Power BI? In Power BI, you can import data from various sources such as Excel files, SQL databases, online services like Google Analytics, and more. You can use the Get Data option to connect to your desired data source and import the data into Power BI for analysis.
4) What are the different types of visualization available in Power BI? Power BI offers a wide range of visualization options including bar charts, line charts, pie charts, maps, tables, matrices, and more. Users can choose the appropriate visualization type based on the data they want to represent.
5) How can you create relationships between tables in Power BI? To create relationships between tables in Power BI, you can use the Manage Relationships option in the Data view. You can define relationships between common fields in different tables to establish connections and enable data analysis across multiple tables.
6) What is the DAX language in Power BI? DAX (Data Analysis Expressions) is a formula language used in Power BI to create calculated columns and measures. It allows users to perform calculations, manipulate data, and create custom calculations to derive insights from the data.
7) How can you share reports in Power BI? In Power BI, you can share reports by publishing them to the Power BI Service and creating a dashboard. You can share the dashboard with other users by granting them access permissions, allowing them to view and interact with the reports online.
8) What is Power Query in Power BI? Power Query is a data connection technology in Power BI that allows users to import, transform, and combine data from different sources. It provides a user friendly interface for data preparation tasks, such as cleaning, shaping, and transforming data before analysis.
9) How do you schedule data refresh in Power BI? In Power BI Service, you can schedule data refresh for your datasets to ensure that the reports are updated with the latest data automatically. You can set up a refresh schedule and configure data source credentials to refresh the data at specific intervals.
10) What is the difference between calculated columns and measures in Power BI? Calculated columns are static columns added to a table by using DAX formulas, whereas measures are dynamic calculations that are applied to the data when a query is executed. Measures are used for aggregations and calculations at the visualization level, while calculated columns are used to add new data columns to the table.
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