RouteMobile Technology Analyst Interview Questions and Answers

There were 3 rounds for data science consultant position at Equifax. 1st round consists of Python and SQL questions and also in this round they have tested analytical thinking as well.

In 2nd round they have asked me questions from my resume and asked me to explain the projects which I have worked on in previous company. In this round they have asked me pandas related questions and asked me write code.

Q1. In Managerial round again here I have been asked questions related my projects. and no coding round in this stage.
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Q1. What is Tuples? How do you convert a string to a tuple?
Ans. 
Tuples are immutable sequences of elements. A string can be converted to a tuple using the tuple() function.
• Tuples are similar to lists but are immutable

• Elements of a tuple are enclosed in parentheses ()

• A string can be converted to a tuple using the tuple() function

• Each character in the string becomes an element in the tuple
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Q2. What is Left Join? Show one Left join for 2 data frames on Python
Ans. 
Left join is a type of join operation in SQL that returns all the rows from the left table and matching rows from the right table.
• Left join is performed using the 'left join' keyword in SQL

• In Python, left join can be performed using the 'merge' function from the pandas library

• Syntax: pd.merge(left_dataframe, right_dataframe, how='left', on='key_column')

• Example: pd.merge(df1, df2, how='left', on='id')
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Q1. Will ask you about experience you have
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Q2. Will ask you about location
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Q3. Will ask you about family
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Q1. About previous work
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Hacker Rank Test with MCQs , problems in data structures and Algo

Q1. In person interview with problem solving exercises in DS and Algo
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Q2. In person interview with system design exercise
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Q1. Introduction Share your experience, take them through your Resume
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Q1. Write a Postgres Query
Ans. 
Query to retrieve all employees from a table named 'employees'
• Use SELECT * FROM employees;

• Make sure to replace 'employees' with the actual table name if different.
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