DATABASE CONCEPTS+MYITLAB
DATABASE CONCEPTS+MYITLAB
18th Edition
ISBN: 9780134821245
Author: KROENKE
Publisher: PEARSON C
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Chapter 4, Problem 4.16RQ

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Cardinality:

Cardinality expresses the specific count of an entity instance of an entity. It may associate with two entities.

Note: An entity instance is an occurrence of a particular entity.

It can be divided into two types:

  • Maximum cardinality
  • Minimum cardinality

Maximum cardinality:

The maximum numbers of entity occurrences that participate in a relationship are termed as maximum cardinality.

The most items that can participate on either side of a relationship are defined as the maximum number in this cardinality.

It can be divided into three types is as follows:

  • One-to-One à An entity has one-to-one relationship with other entity.
  • One-to-Many à An entity has one-to-many relationships with other entity.
  • Many-to-Many à An entity have many-to-many relationships with other entity.

Minimum cardinality:

A minimum number of entity instances that can participate in a relationship are termed as a minimum cardinality.

The least items that can participate on either side of a relationship are defined as the minimum number in this cardinality...

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