It divides data into rows and columns, making it easy to retrieve information based on specific criteria. A primary key is a column or set of columns that uniquely identify each row in a table. It is used to maintain referential integrity between tables.

It divides data into rows and columns, making it easy to retrieve information based on specific criteria. A primary key is a column or set of columns that uniquely identify each row in a table. It is used to maintain referential integrity between tables.