Question

What is primary key ?​

Answer 1

Explanation:

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a

Answer 2

Answer:

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