gNAP Services Power BI Developer Interview Questions and Answers

I come from a close-knit family that values education, support, and togetherness, which has shaped my personal and professional life.

• Supportive Parents: My parents have always encouraged my education and career aspirations, providing guidance and resources.

• Siblings: I have two siblings who inspire me with their achievements; we often collaborate on projects and share ideas.

• Family Traditions: We have regular family gath...read more

In five years, I envision myself as a senior Power BI Developer, leading projects and mentoring others in data visualization.

• I aim to deepen my expertise in Power BI, mastering advanced features like DAX and Power Query.

• I see myself leading a team, guiding junior developers in best practices and innovative solutions.

• I plan to contribute to strategic decision-making by providing actionable insights through data storytel...read more

I expect a supportive and collaborative work environment that values professional growth and provides opportunities for learning and development.

• Supportive and collaborative work environment

• Valuing professional growth

• Opportunities for learning and development

Power Query is a data connection technology that enables you to discover, connect, combine, and refine data across a wide variety of sources.

• Power Query is a data transformation tool in Power BI used to import, transform, and clean data before loading it into the data model.

• It allows users to connect to various data sources such as Excel, databases, web services, and more.

• Users can perform data cleansing, transformatio...read more

summarize is used to aggregate data at a specified level, while summarizetable is used to aggregate data across multiple tables.

• summarize is used with a single table, while summarizetable can be used with multiple tables

• summarize can only be used with columns from the specified table, while summarizetable can be used with columns from multiple tables

• summarize can be used to create new columns, while summarizetable is u...read more

RLS (Row-Level Security) restricts data access for specific users in Power BI reports and dashboards.

• RLS allows you to control who can see what data in your reports.

• You can define roles and rules to filter data based on user identity.

• For example, a sales manager can only see data for their region.

• RLS can be implemented using DAX expressions to create dynamic filters.

• It enhances data security by ensuring users only acce...read more

Incremental refresh in Power BI optimizes data loading by refreshing only new or changed data instead of the entire dataset.

• Incremental refresh allows for efficient data updates, reducing load times.

• It is particularly useful for large datasets that are updated regularly.

• For example, a sales report can refresh only the last month's data instead of the entire year.

• It requires setting up parameters for the date range to i...read more

There are multiple types of filters in Power BI including visual, page, report, and drill-through filters.

• Visual filters apply to a specific visual or group of visuals.

• Page filters apply to all visuals on a specific page.

• Report filters apply to all visuals on all pages of a report.

• Drill-through filters allow users to navigate to a different report page based on a selected data point.

The three filters can be applied to the data in Power BI to narrow down the results.

• Filters can be applied to specific columns or measures in the data

• Filters can be used to show only certain values or ranges of values

• Filters can be combined to create more complex filtering logic

There are three connectivity modes in Power BI: Import, DirectQuery, and Live Connection.

• Import mode: Data is imported into Power BI and stored in a dataset.

• DirectQuery mode: Data stays in the data source and queries are sent directly to the source.

• Live Connection mode: Power BI connects directly to the data source for real-time data access.