Testbook.com Data Engineer Interview Questions and Answers

Question was moderate.based on logical reasoning and math.

Coding test question based on sql and python.

Q1. Basic Skillset questions
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Q2. Projects worked on
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Q1. Knowledge on Marketing tools and case scenarios
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Q1. SQl Queries, Previous projects
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Sql, numpy, pandas, dictionary, pandas group by, merging

Q1. Normal questions
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Round duration - 120 minutes
Round difficulty - Easy

It was a mix of mathematical aptitude, logical ability, and puzzles along with 2 programming questions of easy and medium level. Time was enough and no sectional time was present. 1-2 MCQs on SQL were also present.

This round was immediately followed by an SHL aptitude test which was basically a quick limited time check of your verbal ability and math because many questions were to be done in 1 hour.

Q1. 
Boolean Matrix Transformation Challenge
Given a 2-dimensional boolean matrix mat of size N x M, your task is to modify the matrix such that if any element is 1, set its entire row and column to 1. Specifi...read more
Ans. 
Modify a boolean matrix such that if any element is 1, set its entire row and column to 1.
• Iterate through the matrix and mark rows and columns to be modified

• Use additional arrays to keep track of rows and columns to be modified

• Update the matrix in-place based on the marked rows and columns
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Round duration - 60 minutes
Round difficulty - Easy

It was an online video interview round on HackerEarth with simultaneous code option. It was mostly justifying your resume in the first 15 minutes. After that OOPS was majorly asked. Basics of programming including questions on STL were asked. A class which required inheritance was asked by the interviewer to write. I was helped by the interviewer if i got stuck somewhere, Some questions on implementation of hashmaps and priority queues were also asked. A puzzle was asked which luckily struct to me at that moment.

Q1. What is List comprehension? Print Fibonacci series in python.
Ans. 
List comprehension is a concise way to create lists in Python. Fibonacci series can be printed using list comprehension.
• List comprehension is a compact way to create lists in Python by iterating over an iterable object.

• Fibonacci series can be generated using list comprehension by defining the series logic within the comprehension.

• Example: fibonacci = [0, 1] + [fibonacci[i-1] + fibonacci[i-2] for i in range(2, 10)]
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Q1. You have two table. Employee and salary. Join the table and fetch the 3rd highest salary
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Customer segmentation on Sales Data

Q1. Psychological questions
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Q1. The first round was a basic telephonic interview. Then simple basic SQL questions and some question based on Normalisation and DBMS were asked.
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Q1. This was the toughest Data Analyst Interview I have faced till now. Interview was of 1 hr. Required higher level of SQL understanding. Asked to share screen and then solve SQL queries. Question based on jo...read more
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Q1. Question based on Window Functions in sql
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Q2. Order of execution
Ans. 
Order of execution refers to the sequence in which operations are carried out in a program or system.
• Execution starts from the top of the program and moves downwards.

• Operations within parentheses are executed first.

• Multiplication and division are executed before addition and subtraction.

• Functions are executed when they are called.

• Control structures like loops and conditionals affect the order of execution.
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Q1. Write a sql query to find out different routes for a airline. Table has two columns which are destination and source
Ans. 
Use a SQL query to find different routes for an airline based on source and destination columns in a table.
• Use a SELECT statement to retrieve the distinct combinations of source and destination.

• Use the DISTINCT keyword to ensure only unique routes are returned.

• Order the results by source and destination for easier analysis.
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Q2. Situational questions based on Business KPI
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Q1. Simple discussion on the role and company culture
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Q1. Case study question
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Q1. Basic Discussion on relocation and interest in joining the company.
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Q1. Technical questions mostly around sql, project based and few theoretical questions on python
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Q1. This was one of the most grilled interview i have given, require moderate level of sql understanding, was asked to share screen and solve it , also i had show how it is working then basic questions of py...read more
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Q1. Was asked basic HR questions
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