Primary Key
A primary key is a unique identifier assigned to each entity within an entity type. It guarantees data integrity by identifying every record or entity with a unique identity that eliminates duplication. The primary key in database tables works as a referential point for getting data and manipulating it.
Such as in the “Student” table where the Student ID is the chosen primary key. Through primary keys, queries and indexing are made more efficient raising the overall performance of database operations.
What is an Extension of Entity Type?
Entity Type Extensions are a key issue with a database management system (DBMS) that helps to develop the current entity types without messing with the main structure.
In this article, the definitions, examples, and the importance of the entity type extensions in the database design will be discussed presenting how they are essential to the maintenance of a non-contradictory and efficient data structure and the ability to adapt to the enterprise performance needs that are continuously changing.