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An entity can be place, person, object, event or a concept, which stores data in the database.The characteristics of entities are must have an attribute, and a unique key.Entity relationship diagram displays the relationships of entity set stored in a database.
They might have relationships with Courses and Lecturers.
A real-world thing either living or non-living that is easily recognizable and nonrecognizable.
It may contain entities with attribute sharing similar values.
Entities are represented by their properties, which also called attributes. For example, a student entity may have a name, age, class, as attributes.
It can be identified uniquely by considering the primary key of another entity.
For that, weak entity sets need to have participation.
At first look, an ER diagram looks very similar to the flowchart.
However, ER Diagram includes many specialized symbols, and its meanings make this model unique.
Every entity is made up of some 'attributes' which represent that entity.
Examples of entities: Notation of an Entity Student An entity set is a group of similar kind of entities.