PPN Solutions Power BI Developer Interview Questions and Answers

Q1. Dax query method question
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Q2. Direct query method and formulas
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Scenario based with power BI UI creation

Q1. Structure way of Power BI
Ans. 
Power BI is a business intelligence tool used for data visualization and analysis.
• Power BI allows users to connect to various data sources such as databases, Excel files, and online services.

• Users can create interactive reports and dashboards using Power BI's drag-and-drop interface.

• Power BI offers a wide range of visualization options like charts, graphs, and maps to present data effectively.

• Users can share their repo...read more
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Q2. Reports of Power BI
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Power BI reports are visual representations of data insights, created using Power BI Desktop or Power BI Service.
• Power BI reports are interactive and customizable

• They can include various visualizations like charts, graphs, tables, and maps

• Reports can be shared and accessed online through Power BI Service

• Data can be refreshed in real-time or scheduled updates
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Q1. What is the difference between star schema and snowflake schema?
Ans. 
Star schema has a single fact table connected to multiple dimension tables, while snowflake schema has normalized dimension tables.
• Star schema denormalizes dimension tables, making it easier to query but potentially less efficient for storage.

• Snowflake schema normalizes dimension tables, reducing redundancy but potentially making queries more complex.

• Star schema is commonly used for data warehouses with denormalized da...read more
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Q1. What is the use of GROUP BY clause?
Ans. 
The GROUP BY clause is used in SQL to group rows that have the same values into summary rows.
• It is used with aggregate functions like COUNT, SUM, AVG, etc.

• It helps in summarizing data and generating reports.

• It is often used in conjunction with the HAVING clause to filter grouped data.

• Example: SELECT department, COUNT(employee_id) FROM employees GROUP BY department;
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Q1. Introduction about us and our self
Ans. 
I am a Power BI Developer with 5 years of experience in creating interactive data visualizations and reports.
• I have expertise in Power BI Desktop, Power Query, DAX, and data modeling.

• I have experience in connecting to various data sources like SQL Server, Excel, and SharePoint.

• I have developed dashboards and reports for sales analysis, financial reporting, and KPI tracking.

• I am proficient in creating calculated columns...read more
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Q2. Queshion on power bi and its services
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Q1. Introduction and our eduction
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Q2. Salary
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Asking about work experiences

Q1. What are duplicates and references
Ans. 
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
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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. Tell me about Yourself
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