DataGrokr Interview Questions and Answers

Spark related assignment

Q1. SQL question like select and filter related topics
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Q2. Python to sort numbers
Ans. 
Use the sorted() function in Python to sort numbers in a list.
• Use the sorted() function with the list of numbers as input.

• sorted() function returns a new sorted list without modifying the original list.

• You can use the reverse parameter in sorted() to sort in descending order.

• Example: numbers = [3, 1, 4, 1, 5, 9, 2] sorted_numbers = sorted(numbers) print(sorted_numbers)
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Q1. Explain my experience
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I have experience working as a Data Engineer for 5 years in a tech company, where I was responsible for designing and implementing data pipelines, optimizing data storage and retrieval, and collaborating with cross-functional teams.
• Designed and implemented data pipelines to extract, transform, and load data from various sources

• Optimized data storage and retrieval processes to improve efficiency and performance

• Collabora...read more
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Q2. Learning or study process
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Continuous learning through online courses, books, and hands-on projects.
• Regularly enroll in online courses related to data engineering to stay updated on new technologies and best practices.

• Read books and articles on data engineering to deepen understanding of concepts and techniques.

• Work on hands-on projects to apply theoretical knowledge and gain practical experience.

• Participate in data engineering communities and f...read more
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Q1. Write code for bubble sort ?
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Q2. Find second max employee sal?
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You get an assignment with a deadline of 4-5 days. It's basically the SQL queries and Flask API. So the assignment will be evaluated on code quality and time taken for execution.

Q1. In-depth SQL knowledge required.
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Q2. Any one programming language you prefer and questions will be asked on it.
Ans. 
I prefer Python for data engineering due to its simplicity, extensive libraries, and strong community support.
• Python has libraries like Pandas for data manipulation and NumPy for numerical computations.

• It supports various data formats such as CSV, JSON, and SQL databases.

• Python's readability makes it easier to maintain and collaborate on code.

• It integrates well with big data tools like Apache Spark and Hadoop.

• Python's ...read more
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Q3. Print 1-50 using SQL (not from the table).
Ans. 
Use recursive CTE to print numbers 1-50 in SQL
• Use recursive Common Table Expression (CTE) to generate numbers from 1 to 50

• Start with anchor member as 1 and recursively add 1 until reaching 50

• Select the generated numbers from the CTE
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Q4. Study the assignment you did very well,questions will be on this as well.
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Q5. Will be asked to explain about all your projects mentioned in resume, or even the skills u acquired.
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I attended interview for data engineer intern in March 2024. First round was written test which consisted of 30 questions of 50 marks, Out of which 27 questions are MCQ type and 3 questions are coding.
The coding questions are
1. Write program to find the Fibonacci series
2. Program to check if a linked list is palindrome or not
3. Query to find the Nth highest salary