Question

What is Primary Key?

Answer 1

Primary key is a standard feature of every database management system. A Primary key is a sort of check on the table that every record in the table is unique and does not contain any duplicate data. A table can have only one primary key. The value in the primary key field is different for every record and thus helps in uniquely identifying the record.

Answer 2

A primary key is a special form of a database collection or column.