Question

What is Primary Key? Write down its importance.​

Answer 1

Answer:

A primary key is the column or columns that contain values that uniquely identify each row in a table.

Importance of Primary Key:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.

Answer 2

Answer :

A primary key is the column or columns that contain values that uniquely identify each row in a table.

It is important because -

a) you can easily identify and find unique rows in the database table.

b) They allow you to update/delete only specific records by uniquely identifying them.

( Hope it helps you)