Virtual Employee Senior Developer Interview Questions and Answers

Q1. What is joins with syntax
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Syntax for joins typically involves specifying the tables to join, the columns to join on, and any additional conditions
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Q1. Distance bw 2 nodes in binary tree
Ans. 
To find the distance between two nodes in a binary tree, we can find the distance from the root to each node and then calculate the distance between the two nodes.
• Calculate the distance from the root to each node using a recursive function

• Find the lowest common ancestor of the two nodes

• Calculate the distance from each node to the lowest common ancestor and add them together to get the total distance
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Q2. Valid sudoku of 9*9
Ans. 
A valid sudoku of 9*9 is a grid where each row, column, and 3x3 subgrid contains the numbers 1-9 without repetition.
• Each row must contain the numbers 1-9 without repetition

• Each column must contain the numbers 1-9 without repetition

• Each 3x3 subgrid must contain the numbers 1-9 without repetition
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It's was MCQ based test

Q1. Tell me some of the oops concepts
Ans. 
Some OOP concepts include inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q1. What is Guid Id please explain
Ans. 
A Guid Id is a globally unique identifier used in software development to uniquely identify objects or entities.
• Guid Ids are 128-bit integers represented as a hexadecimal string.

• They are typically used in databases, APIs, and various software systems to ensure uniqueness.

• Example: 6B29FC40-CA47-1067-B31D-00DD010662DA
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Q1. Discussion about salary
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Q1. Abstract class and interface
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Q2. Oops concepts and
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Profit and loss average , simple intesest

Fibonacci numbers , prime numbers , even odd numbers

Q1. Check Valid parenthesis
Ans. 
Check if a string of parentheses is valid
• Use a stack to keep track of opening parentheses

• Pop from stack when encountering a closing parenthesis

• If stack is empty at the end and all parentheses are matched, it is valid
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Medium leveln coding round

Q1. Tell me about yourself
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Q1. Technical questions
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