Mapping cardinalities
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Mapping cardinality describes the number of entities in one set that can be associated with entities in another set via a relationship. There are four types of mapping cardinality: one-to-one, where each entity is associated with exactly one entity in the other set; one-to-many, where an entity can be associated with multiple entities but each entity can only be associated with one entity; many-to-one, the inverse of one-to-many; and many-to-many, where each entity can be associated with multiple entities in the other set.
Mapping cardinalities
- 2. What is Mapping Cardinality? Mapping cardinality or cardinality ratios express the number of entities to switch another entity can be associated via a relationship set. Mapping Cardinality 2/9
- 3. Types of Mapping Cardinality For a binary relationship set the mapping cardinality must be one of the following types: 1.One to one 2.One to many 3.Many to one 4.Many to many Mapping Cardinality 3/9
- 4. Mapping Cardinality Mapping Cardinality One-to-one relationship: An entity in A is associated with at most (only) one entity in B is associated with at most (only) one entity in A.
- 5. Mapping Cardinality Mapping Cardinality One-to-Many relationship: An entity in A is associated with any number (zero or more) of entities in Band an entity in B is associated with at most one (only) entity in A.
- 6. Mapping Cardinality Mapping Cardinality Many-to-one relationship: An entity in A is associated with at most (only) one entity in B and an entity in B is associated with any number (zero or more) of entities in A.
- 7. Mapping Cardinality Mapping Cardinality 7/9 Many-to-many relationship: An entity in A is associated with any number (zero or more) of entities in Band an entity in B is associated with any number (zero or more) of entities in A.
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- 10. Thank You 9/9
Editor's Notes
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