The document is a presentation about mapping cardinality in database management systems. It defines mapping cardinality as the number of entities in one relationship set that can be associated with entities in another relationship set. It describes the four types of mapping cardinality: one-to-one, where each entity is associated with at most one entity in the other set; one-to-many, where an entity can be associated with multiple entities but each associated entity is only associated with one; many-to-one, the inverse of one-to-many; and many-to-many, where entities can be associated with multiple entities in the other set.

1. Pundra University of Science & Technology
Rangpur Road, Gokul, Bogura
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Welcome To My Presentation
Name: Md. Soumik Ahmmed
Department: Computer Science & Engineering
Course Title: Database Management System
Course Code: CSE 311
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2. Presentation topic:
Mapping Cardinality
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Mapping Cardinality

3. 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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Mapping Cardinality

4. 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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Mapping Cardinality

5. Mapping Cardinality
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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.

6. Mapping Cardinality
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 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.

7. Mapping Cardinality
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 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.

8. 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.

9. Thank You
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10. Thank You
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