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Sunday, March 20, 2016

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What are Mapping Cardinalities?

Leke Oyetoke - Sunday, March 20, 2016

What are Mapping Cardinalities?

Mapping Cardinality identifies the number of entities in one entity set, which can be connected with the number of entities of other set through relationship set.

1. One-to-one: One entity from entity set A can be connected with at most one entity of entity set B and vice versa.

2. One-to-many: One entity from entity set A can be related with more than one entities of entity set B, though an entity from entity set B can be connected with at most one entity.

3. Many-to-one: More than one entities from entity set A can be connected with at most one entity of entity set B, but an entity from entity set B can be related with more than one entity from entity set A.

4. Many-to-many: One entity from A can be linked with more than one entity from B and vice versa.


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