Entity-Relationship Model
The (E-R) data model is based on a perception of a real worker that consists of a collection of basic objects, called entities, and of relationships among these objects.
The entity-relationship model for data uses three features to describe data. They are;
1. Entities, which specify distinct real-world items in an application.
2. Relationships, which connect entities and represent meaningful dependencies between them.
3. Attributes, which specify properties of entities and relationships.
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