Question

what is primary key​

Answer 1

Answer:

HERE IS YOUR ANSWER

Explanation:

A primary key  is 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). . A relational database must always have one and only one primary key. Primary keys typically appear as columns in relational database tables.

Answer 2

Answer:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.

A primary key is used as a unique identifier to quickly parse data within the database and find the relation between different tables. A relational database cannot have more than one primary key.