MongoDB SDE (Software Development Engineer) Interview Questions and Answers

Aptitude test will a hackerrank test where it might have technical MCQ and/or coding test.

Q1. Interviewer will test your logic building capability with puzzel/coding and technical questions and experience discussion.
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Q1. Its a normal discussion with HR about CTC and all.
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Round duration - 90 minutes
Round difficulty - Medium

It was Technical + Aptitude MCQ round.The technical section consisted if MCQ related to DSA,OS,DBMS.The aptitude section consisted of questions related to basic mathematics.

Q1. 
Candies Distribution Problem Statement
Prateek is a kindergarten teacher with a mission to distribute candies to students based on their performance. Each student must get at least one candy, and if two s...read more
Ans. 
The task is to distribute candies to students based on their performance while minimizing the total candies distributed.
• Create an array to store the minimum candies required for each student.

• Iterate through the students' ratings array to determine the minimum candies needed based on the given criteria.

• Consider the ratings of adjacent students to decide the number of candies to distribute.

• Calculate the total candies req...read more
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Round duration - 30 minutes
Round difficulty - Medium

It was a technical interview testing the basic skills of OS and DBMS of candidates along with few project discussions from your CV.

Q1. Can you write 15 Linux commands along with their functions?
Ans. 
List of 15 Linux commands with their functions
• ls - list directory contents

• pwd - print working directory

• cd - change directory

• mkdir - make a new directory

• rm - remove files or directories

• cp - copy files and directories

• mv - move or rename files and directories

• grep - search for patterns in files

• chmod - change file permissions

• ps - display information about running processes

• top - display and update sorted information about pr...read more
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Q2. What are DDL (Data Definition Language) and DML (Data Manipulation Language)?
Ans. 
DDL is used to define the structure of database objects, while DML is used to manipulate data within those objects.
• DDL includes commands like CREATE, ALTER, DROP to define database objects like tables, indexes, etc.

• DML includes commands like INSERT, UPDATE, DELETE to manipulate data within tables.

• Example of DDL: CREATE TABLE employees (id INT, name VARCHAR(50));

• Example of DML: INSERT INTO employees VALUES (1, 'John Doe
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DBMS.

Q1. What is data integrity?
Ans. 
Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle.
• Data integrity ensures that data is accurate and consistent in storage and transmission.

• It involves maintaining the quality and reliability of data over time.

• Methods for ensuring data integrity include checksums, encryption, and error detection codes.

• Examples of data integrity violations include data corruption, unautho
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Q2. What is a trigger in the context of a database management system?
Ans. 
A trigger is a special type of stored procedure that automatically executes when certain events occur in a database.
• Triggers are used to enforce business rules, maintain data integrity, and automate repetitive tasks.

• They can be triggered by INSERT, UPDATE, or DELETE operations on a table.

• Examples of triggers include auditing changes to a table, updating related tables when a record is modified, or enforcing referential
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Q3. What is the difference between clustered and non-clustered indexes in a database management system?
Ans. 
Clustered indexes physically order the data in the table, while non-clustered indexes do not.
• Clustered indexes determine the physical order of data in the table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are faster for retrieval of data, especially range queries, compared to non-clustered indexes.

• Non-clustered indexes are stored se...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions on DBMS.

Q1. What is the difference between UNION and UNION ALL in SQL?
Ans. 
UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
• UNION merges the result sets of two or more SELECT statements and removes duplicates.

• UNION ALL merges the result sets of two or more SELECT statements without removing duplicates.

• UNION is slower than UNION ALL as it involves removing duplicates.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column...read more
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Q2. What are the functions of a cursor in PL/SQL?
Ans. 
A cursor in PL/SQL is used to retrieve and process multiple rows of data one at a time.
• Allows iteration over a result set

• Retrieves data row by row

• Can be used to update or delete rows in a table

• Must be declared, opened, fetched, and closed
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Q3. Write a SQL query to fetch the nth highest salary from a table.
Ans. 
SQL query to fetch the nth highest salary from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to fetch the nth highest salary
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Round duration - 30 minutes
Round difficulty - Easy

This was a managerial round with typical behavioral problems.