Question

What is a primary key ?

Hint:

A primary key is like a Student ID number or a Social Security Number. It's a unique identifier for a specific record that guarantees you won't mix it up with any other record.

Answer 1

A primary key is a column or a set of columns in a relational database table that uniquely identifies each row (record) in that table. A primary key must have a unique value for each row and cannot contain null values. It is a fundamental concept for ensuring data integrity and is used to create relationships between different tables.