Epsilon Interview Questions, Process, and Tips

Q1. It was all about java oops and basic questions
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Q1. It will related to the our project and some scenario based questions
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Q1. Salary discussion
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Q1. What is difference between groupby and having
Ans. 
Groupby is used to group data based on a specific column, while having is used to filter grouped data based on a condition.
• Groupby is used to group data based on a specific column in SQL.

• Having is used to filter grouped data based on a condition in SQL.

• Groupby is typically used with aggregate functions like SUM, COUNT, AVG, etc.

• Having is used after the GROUP BY clause to filter groups based on a condition.
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Q2. SQL joins - Difference between cross join and self join
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Cross join combines every row from one table with every row from another table. Self join joins a table with itself.
• Cross join produces a Cartesian product of the two tables involved.

• Self join is used to join a table with itself, typically to compare rows within the same table.

• Cross join does not require a common column between the two tables.

• Self join requires a common column to join the table with itself.

• Example of c...read more
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Q1. Hyper parameter tuning
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Q1. Why join epsilon?
Ans. 
Epsilon offers cutting-edge technology, diverse projects, and a collaborative work environment.
• Epsilon provides opportunities to work with advanced technology and tools in data science.

• The company offers a wide range of projects across various industries, allowing for diverse and challenging work.

• Epsilon fosters a collaborative work environment, encouraging teamwork and knowledge sharing among data scientists.

• The compa...read more
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Q1. Projects and technical background
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Q1. Write a program to print odd and even number using multithreading
Ans. 
Program to print odd and even numbers using multithreading
• Create two separate threads for printing odd and even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure proper ordering of output

• Example: Thread 1 prints odd numbers (1, 3, 5, ...) and Thread 2 prints even numbers (2, 4, 6, ...)
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Basic to intermediate level SQL questions.

Q1. Previous work experience.
Ans. 
I have 3 years of experience as a Data Analyst in a tech company.
• Analyzed large datasets to identify trends and patterns

• Created visualizations and reports to communicate findings to stakeholders

• Collaborated with cross-functional teams to improve data quality and accuracy
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Q1. Tech + managerial round with US team.
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Q1. SQL, python, pyspark
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Q1. SQL, PYSPARK, PYTHON
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Q2. Sql, python, pyspark
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Q1. Sql, python, pyspark
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Q1. Salary discussion, NP
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