Systems Analysis and Design - Entity Relationship Diagrams (E-R)

[@eyadbereh]

Thank you very much, great explanation.
A good example of unary relationships is the relationship between a course and its prerequisites, so each course have zero or more prerequisite courses, it's a many-to-many relationship between the course entity and itself.

[@antarboua1988]

Thanks a lot, add a practice Access Information System with VBA...please

[@prajwolchand102]

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