Mapping Cardinalities using E-R Diagrams
- One-to-One Mapping Cardinalities
- One-to-Many Mapping Cardinalities
- Many-to-One Mapping Cardinalities
- Many-to-Many:
- Weak Entity Set: A Entity Set without a Primary Key
There is a strong entity set and a weak entity set in the above diagram.
- Strong Entity Set: A Entity Set with a Primary Key
Mapping Cardinalities Using E-R Diagram In Database.