Exl India Data Engineer Interview Questions and Answers

Talk to the head hunter. General phone screening

Q1. Talk to the hiring manager and another manager from BI. Asked about work experience and gave me a SQL test
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Shared a dataset and wanted me to provide some insights and also build some slides to present

First round was aptitude test,duration is of 25 minutes involves SQL,PowerBI,Python, Qunatitative Aptitude,SAS skillset

Q1. Sql joins ,proimary key, foreign key,window functions
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Q2. What are the different types of charges associated with logistics?
Ans. 
Logistics charges encompass various costs incurred in the transportation and storage of goods.
• Transportation Costs: Fees for moving goods via truck, rail, air, or sea. Example: Freight charges for shipping a container.

• Warehousing Fees: Costs associated with storing goods in a warehouse. Example: Monthly rental fees for storage space.

• Handling Charges: Fees for loading and unloading goods. Example: Charges for palletizin...read more
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Q3. What is the SQL query to retrieve the top three maximum salaries from a table?
Ans. 
Retrieve the top three maximum salaries using SQL with ORDER BY and LIMIT clauses.
• Use the SELECT statement to specify the column (salary) you want to retrieve.

• ORDER BY salary DESC to sort the salaries in descending order.

• Use LIMIT 3 to restrict the result to the top three salaries.

• Example SQL query: SELECT salary FROM employees ORDER BY salary DESC LIMIT 3;
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SQL, Python and Power BI

Q1. The interviewer asked about the projects that i have done.
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Q2. Tell me about some of the projects that you have done.
Ans. 
I have worked on various data engineering projects, focusing on ETL processes, data warehousing, and real-time data pipelines.
• Developed an ETL pipeline using Apache Airflow to automate data extraction from multiple sources and load it into a data warehouse.

• Implemented a real-time data processing system using Apache Kafka and Spark Streaming for monitoring user activity on a web application.

• Designed a data warehouse sch...read more
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Python, SQL, Aptitude

Q1. SQL - A table EmployeeSkills was given having two columns EmpID & Skills. There can be multiple for an employee id with skills he possess. You need to find the EmpID having skills in Python and SQL
Ans. 
Find employees with both Python and SQL skills from the EmployeeSkills table.
• Use a GROUP BY clause to group by EmpID.

• Use a HAVING clause to filter groups that contain both skills.

• Example SQL query: SELECT EmpID FROM EmployeeSkills WHERE Skills IN ('Python', 'SQL') GROUP BY EmpID HAVING COUNT(DISTINCT Skills) = 2.
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Q2. PowerBI - Create Bookmarks in Power BI
Ans. 
Bookmarks in Power BI allow users to save the state of a report, including filters, slicers, and visuals.
• Bookmarks can be created by selecting 'View' and then 'Bookmarks' in the Power BI toolbar.

• Users can add bookmarks by selecting 'Add' and then naming the bookmark.

• Bookmarks can be applied by selecting the desired bookmark from the 'Bookmarks' pane.

• Bookmarks can be used to save different views of a report for easy acc...read more
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Q3. SQL - Find cumulative Profit sum in a given table.
Ans. 
Use SQL query with window function to find cumulative profit sum in a given table.
• Use window function like SUM() with ORDER BY clause to calculate cumulative profit sum.

• Example: SELECT date, profit, SUM(profit) OVER (ORDER BY date) AS cumulative_profit FROM table_name;

• Ensure the table has a column for date and profit to order and calculate cumulative sum.
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