Question

write two types of primary key. ?​

Answer 1

Answer:

Types of Keys in Database Management System

Primary Key - is a column or group of columns in a table that uniquely identify every row in that table. Candidate Key - is a set of attributes that uniquely identify tuples in a table. Candidate Key is a super key with no repeated attributes.

Answer 2

Answer:

Explanation:

A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.

There are two types of key in database mangement system.

1. primary key - It is a column or group of columns in a table that uniquely identify every row in that table

2. Candidate key - It  is a set of attributes that uniquely identify tuples in a table.