Question

what is primary key?​

Answer 1

Answer:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.

Explanation:

☆Plz follow me friend and mark this answer as a brainlist answer ☆

Answer 2

Answer:

IN DATABASE , " PRIMARY KEY " IS THE KEY USED FOR MINIMAL SET OF ATTRIBUTES THAT UNIQUELY SPECIFY A TUPLE IM RELATION !

（＾_＾） ____✌