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E r diagram
- 2.
Conceptual Data Model)
E-R
- 14. Unary
entity instance
entity type
- 15. Binary
entity instance 2
entity type
- 16. Ternary
entity instance 3
entity type
- 17.
Cardinality Constraints
Participation Constraints
- 18.
3
One-to-one relationship
One-to-many relationship
many-to-many relationship
- 19. One-to-one relationship
1 1
- 20. One-to-many relationship
1 M
- 21. many-to-many relationship
M N
- 22.
Total Participation ( )
Partial Participation ( )
Total Participation Partial Participation
M N
- 24.
Entity Relationship Diagram
Primary key