LTIMindtree Senior Power BI Developer Interview Questions and Answers

Q1. Technical Background Evaluation
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Q2. Role level technical questions
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Q1. Azure Data Factory, Kusto Query, Azure SQL
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Q1. Salary Discussion and notice period
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Q1. Wat is cardinality
Ans. 
Cardinality refers to the uniqueness of values in a column or relationship.
• Cardinality is the number of unique values in a column or relationship.

• High cardinality means a column has many unique values, while low cardinality means few unique values.

• For example, a column like 'Customer ID' may have high cardinality, while 'Gender' may have low cardinality.
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Q2. Challenges faced
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Q1. Write SQL query
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SQL query to retrieve data from a table
• Use SELECT statement to specify columns to retrieve

• Use FROM statement to specify the table to retrieve data from

• Use WHERE statement to filter the data based on conditions
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Q1. What are duplicates and references
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Duplicates are identical copies of data, while references are pointers to the same data in memory.
• Duplicates are exact copies of the original data.

• References point to the same data in memory.

• Duplicates can lead to inconsistencies in data analysis.

• References are more memory efficient than duplicates.
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Q2. How do you implement incremental refresh
Ans. 
Incremental refresh in Power BI allows for loading only new or modified data to improve performance.
• Set up incremental refresh policy in Power BI Service

• Define a range of values for the refresh policy

• Use parameters to filter data based on the refresh policy

• Schedule regular refreshes to update the dataset
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Q1. What are the components of Power bi
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Power BI components include Power Query, Power Pivot, Power View, Power Map, and Power Q&A.
• Power Query: Used for data extraction and transformation.

• Power Pivot: Used for data modeling and analysis.

• Power View: Used for interactive data visualization.

• Power Map: Used for geographical data visualization.

• Power Q&A: Allows users to ask questions in natural language and get answers from data.
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Q2. What is mean by DAX
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DAX stands for Data Analysis Expressions and is a formula language used in Power BI for creating custom calculations.
• DAX is used to create custom calculations in Power BI, similar to Excel formulas.

• It can be used to create calculated columns, measures, and calculated tables.

• DAX functions can be used to manipulate data, perform calculations, and create complex expressions.

• Examples of DAX functions include SUM, AVERAGE,
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Q3. What is mean by M language
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M language is a powerful data transformation language used in Power Query in Power BI.
• M language is used to transform and clean data in Power BI.

• It is a functional language with a wide range of functions and operators.

• M language is case-sensitive and uses a step-by-step approach to data transformation.

• Examples of M language functions include Table.TransformColumns and List.Transform.
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It was a real-time scenario that they asked about.

Q1. Scenario based question on Power BI summarized table view concept
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Q2. How to achieve dynamic chart based on selection button
Ans. 
Use Power BI bookmarks and buttons to dynamically change chart visuals based on user selection.
• Create multiple chart visuals for different data sets

• Use bookmarks to save different chart configurations

• Link selection buttons to bookmarks to dynamically switch between charts
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Q1. Tell us about your latest project
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Q1. Difference Between direct query mode and import mode
Ans. 
Direct query mode connects to data source in real-time, while import mode loads data into Power BI for faster analysis.
• Direct query mode connects to data source in real-time, providing up-to-date data

• Import mode loads data into Power BI for faster analysis, but may not always reflect real-time changes

• Direct query mode is suitable for large datasets that require real-time updates

• Import mode is suitable for smaller datas
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Q2. Define powerBI in layman poin of view
Ans. 
PowerBI is a data visualization tool that helps users analyze and visualize data to make informed business decisions.
• PowerBI helps in creating interactive reports and dashboards

• It allows users to connect to various data sources like Excel, SQL databases, and cloud services

• Users can create custom visualizations and share insights with others

• PowerBI can be used for data exploration, data modeling, and data storytelling
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Q1. How the end user access the report
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End users can access the report through Power BI Service, Power BI Mobile App, or embedded in other applications.
• End users can access the report through Power BI Service by logging in with their credentials

• End users can also access the report through Power BI Mobile App on their smartphones or tablets

• Reports can be embedded in other applications using Power BI Embedded feature
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