Entity relationship model

1. What is meant by entity relationship model?
2. What is entity relationship model give an example?
3. What are the 3 main components of entity relationship modeling?
4. What are the types of entity relationship model?

What is meant by entity relationship model?

Definition. The entity relationship model (ERM) is a conceptual model that represents the information structure of a problem domain in terms of entities and relationships. The result of modeling using the ERM is graphically represented as an entity relationship diagram (ERD).

What is entity relationship model give an example?

An ER model is used to represent real-world objects. An Entity is a thing or object in real world that is distinguishable from surrounding environment. For example, each employee of an organization is a separate entity.

What are the 3 main components of entity relationship modeling?

ER diagrams or ERD's are composed of three main elements: entities, attributes, and relationships.

What are the types of entity relationship model?

There are two kinds of ER diagrams: conceptual and physical. Conceptual diagram models can provide the foundation for logical data models or show commonality relationships between ER models as a basis for data-model integration.