Revolve Solutions Power BI Developer Interview Questions and Answers

Q1. What is power query
Ans. 
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
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Q2. Diff between summarize and summaruzetable
Ans. 
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
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Q1. ROW LEVEL SECURITY
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Q2. SUM, SUMIF SUMIFS AND DELETE TRUNCATE
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Q1. 1. Power bi optimization
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Q2. 2. Highest salary in SQL 3. Write stored procedure 4. SQL join query
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Q1. What is your expectations from this company
Ans. 
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
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Q2. I want to get into good data analytics project and learn latest tech
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Q1. What is Rls
Ans. 
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
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Q2. Explain Incremental refresh
Ans. 
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
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Q1. Connection modes in Power BI and how they work
Ans. 
Power BI has three connection modes: Import, DirectQuery, and Live Connection.
• Import mode imports data into Power BI and creates a dataset.

• DirectQuery mode connects to the data source and queries data in real-time.

• Live Connection mode connects to a published dataset in Power BI Service.

• Import mode is best for small to medium-sized datasets, while DirectQuery and Live Connection are better for large datasets.

• DirectQuery...read more
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Q2. Row level security in Power BI
Ans. 
Row level security in Power BI allows restricting data access based on user roles and filters.
• Row level security can be implemented using roles and filters in Power BI.

• Roles can be created and assigned to users or groups to restrict access to specific data.

• Filters can be applied to tables or columns to limit data visibility based on user roles.

• Row level security can be tested using the View As Roles feature in Power BI...read more
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Asking about work experiences

Q1. 1. what is the current company?. 2. what is the current CTC and ECTC ? 3. are u contract are direct payrool?
Ans. 
The current company is XYZ Corporation.
• The current company is XYZ Corporation.

• XYZ Corporation is a multinational technology company.

• XYZ Corporation specializes in software development and data analytics.

• XYZ Corporation has a strong presence in the Power BI industry.
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Q2. Where u work location?
Ans. 
I work remotely from my home office.
• I work from a dedicated home office space.

• I have all the necessary equipment and tools to work remotely.

• I communicate with my team and clients through online collaboration tools.

• I am available for meetings and discussions via video conferencing.

• I maintain a productive work environment at home.
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