Question

are primary keys always in text form?

Answer 1

Answer:

Primary key

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 are simply a single attribute: a unique id. More formally, a primary key is a choice of candidate key; any other candidate key is an alternate key.

Explanation: