Top 10 Deloitte Power BI Interview Question Answers for Data Analyst

Top 10 Deloitte Power BI Interview Question Answers for Data Analyst

Here are the answers to the Deloitte Power BI interview questions:

1. How can you configure and use custom visuals in Power BI?
   Configuring custom visuals in Power BI:
   • Download and import custom visuals from the Microsoft AppSource or Power BI Visuals Marketplace.
   • Enable custom visuals in Power BI settings.
   • Add the visual to a report and configure its properties.
2. What techniques can be employed to improve query performance in Power BI?
   Improving query performance in Power BI:
   • Optimize data models and relationships.
   • Use efficient DAX formulas and measures.
   • Implement data reduction techniques (e.g., aggregations, filtering).
   • Leverage query optimization features (e.g., query folding, parallel processing).
3. Describe the integration capabilities of Power BI with other Microsoft services.
   Power BI integration with Microsoft services:
   • Azure: data storage, machine learning, and analytics.
   • Dynamics: ERP and CRM data integration.
   • Excel: data analysis and reporting.
   • SharePoint: report embedding and collaboration.
   • Teams: report sharing and discussion.
4. What is the difference between Import mode and DirectQuery mode in Power BI?
   Import mode vs. DirectQuery mode:
   • Import mode: data is copied into Power BI, allowing for faster performance but potentially outdated data.
   • DirectQuery mode: data remains in the original source, allowing for real-time updates but potentially slower performance.
5. How do you create a pareto chart in Power BI?
   Creating a Pareto chart in Power BI:
   • Use the “Ribbon Chart” custom visual.
   • Add a measure for the cumulative percentage.
   • Configure the chart to display the top categories.
6. What are the advantages of using Power BI templates?
   Advantages of Power BI templates:
   • Saves time and effort.
   • Ensures consistency in reporting.
   • Provides pre-built data models and visuals.
   • Facilitates collaboration and sharing.
7. Explain the concept of dataflows in Power BI.
   Dataflows in Power BI:
   • Dataflows allow for data preparation, transformation, and loading.
   • Enable data reuse and sharing across reports.
   • Support data governance and quality control.
8. What is the purpose of the “Merge Queries” feature in Power BI, and how is it used?
   “Merge Queries” feature:
   • Combines data from multiple tables or queries.
   • Supports inner, outer, left, and right merges.
   • Enables data integration and transformation.
9. How do you create and manage data alerts in Power BI?
   Creating and managing data alerts in Power BI:
   • Set up data alerts on dashboards or reports.
   • Define alert conditions (e.g., threshold values).
   • Configure notification options (e.g., email, mobile).
   • Manage and monitor alerts in the Power BI service.