ENTREPRENEURSHIP

Detailed explanation-1: -A primary key is the column or columns that contain values that uniquely identify each row in a table. A database table must have a primary key for Optim to insert, update, restore, or delete data from a database table. Optim uses primary keys that are defined to the database.

Detailed explanation-2: -The primary key is the minimal set of attributes which uniquely identifies any row of a table. The primary key cannot have a NULL value. It cannot have duplicate values.

Detailed explanation-3: -A primary key helps us to uniquely identify a record in a relational database. a primary key is a unique identifier for each record or row of data. It ensures that no two records have the same key value. In a table, only one primary key is allowed.