Question

What is a primary key?state it's use in a table​

Answer 1

Answer:

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.

Explanation:

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Answer 2

Answer:

The PRIMARY KEY constraint uniquely identifies each record in a table is called primary key.

use

A primary key is a field in a table which uniquely identifies each row in a database table

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