Volansys Technologies Software Engineer Trainee Interview Questions and Answers

It was basic maths and vocabulary questions

Q1. What is the difference between primary key and foreign key?
Ans. 
Primary key uniquely identifies a record in a table, while foreign key refers to a field in another table.
• Primary key is used to enforce data integrity and ensure uniqueness of records.

• Foreign key is used to establish a relationship between two tables.

• A table can have only one primary key, but multiple foreign keys.

• Primary key cannot have null values, while foreign key can have null values.

• Example: In a database of stu...read more
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Q2. What is inheritance and types of inheritance.
Ans. 
Inheritance is a mechanism in OOP where a new class is derived from an existing class.
• It allows the new class to inherit the properties and methods of the existing class.

• Types of inheritance include single, multiple, multilevel, hierarchical, and hybrid inheritance.

• Single inheritance involves a child class inheriting from a single parent class.

• Multiple inheritance involves a child class inheriting from multiple parent ...read more
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