Question

on what basis do we decided a primary key in a database​

Answer 1

Answer:

we decide primary key on the database so that no one can change the data which we put in our information chart. And the data on the field don't change on going to some other tab or cell.

Explanation:

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Answer 2

Answer:

In the relation model of database, a primary key is a specific choice of a minimal set of attributes that uniquely specifically a tunple in a relation.