Amazon Research Analyst Interview Questions, Process, and Tips

Medium to Hard 4 DSA questions

Q1. CV discussion and question related to python and data science
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Q2. Cumulative sum of an array, frequency of each word in a sentence
Ans. 
The question asks about calculating cumulative sum of an array and frequency of each word in a sentence.
• To calculate cumulative sum of an array, we can use a loop and keep adding the current element to a running sum variable.

• To calculate frequency of each word in a sentence, we can split the sentence into words and use a dictionary to keep track of the count of each word.

• We can use built-in functions in programming lan...read more
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Q1. Behavioural Questions
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Q2. Leadership principles
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Q1. Data Science and SQL round
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Q2. Groupby, joins and window functions
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Q1. CV discussion and data science question
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Round duration - 60 minutes
Round difficulty - Medium

Started with project description, deep dive into project
Questions about ML, Statistics
Coding questions for Python, SQL

Q1. 
Stream of Characters Problem Statement
You are provided with a list, DICTIONARY[], which contains a collection of words, along with a stream of characters (queries). The task is to implement a class Chara...read more
Ans. 
Implement a class to check if a string formed by the last queried characters exists in a dictionary of words.
• Initialize the class with the dictionary of words.

• Implement a method to check if the string formed by the last queried characters exists in the dictionary.

• Use appropriate data structures to efficiently solve the problem.

• Ensure the class handles multiple test cases and character queries.

• Example: DICTIONARY[] = ['...read more
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Q2. How do you retrieve the second highest salary from a SQL database?
Ans. 
Use a subquery to retrieve the second highest salary from a SQL database.
• Use a subquery to select the maximum salary from the table.

• Then use another subquery to select the maximum salary that is less than the maximum salary found in the first step.

• Combine both subqueries to retrieve the second highest salary.
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Round duration - 60 minutes
Round difficulty - Easy

Projects
Machine Learning

Q1. Aptitude Questions
Questions about Statistics
Ans. 
Answering aptitude questions related to statistics
• Statistics is the study of collecting, analyzing, interpreting, presenting, and organizing data.

• Key concepts include mean, median, mode, standard deviation, and probability.

• Examples of statistical questions include 'What is the average income of a population?' and 'What is the likelihood of an event occurring?'
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Round duration - 60 minutes
Round difficulty - Easy

Behavioral Round
Questions asked about Amazon Leadership Principles

Round duration - 60 minutes
Round difficulty - Easy

Medium Python questions
Medium SQL questions

Q1. Ninja and Mathematics
Ninja is a genius in mathematics. He got an interview call from MIT. During the interview, the professor asked Ninja a challenging question.
Given two integers 'N1' and 'N...read more
Ans. 
Calculate the fraction when one integer is divided by another, with repeating decimal parts enclosed in parentheses.
• Divide the first integer by the second integer to get the fraction

• Identify if the fractional part is repeating and enclose it in parentheses

• Return the fraction for each test case
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Q2. How can you find the top 2 salaries for each department in SQL?
Ans. 
Use SQL query with window functions to find top 2 salaries for each department.
• Use PARTITION BY clause to partition the data by department.

• Use ORDER BY clause to order the salaries in descending order.

• Use ROW_NUMBER() function to assign a rank to each row within the partition.

• Filter the results to only include rows with rank 1 and 2.
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