Question

Difine primary key in short​

Answer 1

Answer:

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.

Explanation:

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Answer 2

Answer:

Primary key is used to identify data uniquely therefore two rows can't have the same primary key. It can't be null.

or

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). 

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