1. Entity Relationship Diagram

2. Introduction Definition: Entity-relationship diagram is a data-modeling technique that visualises entities, the attributes of the entities, and the relationship between entities, within an information system.

3. Components Entity Attributes Relationship Cardinality Participation Constraint

4. Cardinality Definition: The number of elements in a set or other grouping, as a property of that grouping

5. Participation Constraint Definition: specifies whether the existence of an entity depends on its being related to another entity via the relationship type

6. Relationship One to one One to many Many to many

7. ER Diagram using Crow’s Foot Notation

8. Crow’s Foot Notation

9. ER Diagram using Chen’s Notation

10. Chen’s Notation

11. Chen’s notation