E-R Model Concepts

E-R Model Concepts

Entities
Entities are specific objects or things in the mini-world that are represented in the database

Ex :-a company, a job, or a university course.



What Should an Entity Be?

SHOULD BE:

An object that will have many instances in the database

An object that will be composed of multiple attributes

An object that we are trying to model

SHOULD NOT BE:

A user of the database system

An output of the database system (e.g., a report)