Entity Relationship Diagrams (ERDs) illustrate the logical structure of databases. In the ER model, the structure of data is represented graphically, as an “entity-relationship diagram,” using three Principal element types:
Entity Sets: An entity is an abstract object of some sort, and a collection of similar entities forms an entity set.
Attributes: The properties of the entities in the set.
Relationship: The connections among two or more entity Sets.
Example of E R Diagram
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