FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Primary Key-a field containing a value that uniquely identifies each record in a table. Primary Key-a field containing a value that uniquely identifies each record in a table. The primary key is unique and prevents entering duplicate records or a null value in that field.

Detailed explanation-2: -Primary key A table can have only one primary key. A primary key consists of one or more fields that uniquely identify each record that you store in the table.

Detailed explanation-3: -A primary key is a column of table which uniquely identifies each tuple (row) in that table.

Detailed explanation-4: -A specific choice of columns which uniquely identified rows called primary key.