Concept explainers
Explanation of Solution
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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Database Concepts (8th Edition)
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