Question

What is a primary key?​

Answer 1

A primary key is a key in a relational database that is unique for each record.



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Answer 2

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 are simply a single attribute: a unique id.

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