Simple slide on Mapping Cardinalities

1. Topic:
Mapping Cardinality
Mapping Cardinality

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.
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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
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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
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 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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9. Thank You
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