Entities, Entity Sets and Entity Types
Explore the concepts of entities entity types and entity sets within the Entity-Relationship data model. Understand how entities are differentiated by their attributes and how groups of similar entities form entity sets. Learn to recognize entity types and their representation in ER diagrams to support fundamental database design.
We'll cover the following...
We'll cover the following...
What is an entity?
An entity is an object in the real world with an independent existence that can be differentiated from other objects. An entity might be:
- An object with physical existence (e.g., a lecturer, a student, a car).
- An object with conceptual existence (e.g., a course, a job, a position).
Each entity has attributes which are the particular properties that ...