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   • Import mode: data is copied into Power BI, allowing for faster performance but potentially outdated data.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.