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.

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.
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.

8. If you have any question, feel free
to ask arafatpub@gmail.com
or
Visit:
techbeginnerstpoint.blogspot.com

9. Thank You
9/9

10. Thank You
9/9