Final answer:
In Crow's Foot E-R diagrams, maximum cardinality is expressed using Crow's Foot notation which uses symbols to represent relationships between entities in a database. There are three symbols used to represent maximum cardinality: One or 1, Many or N, and Zero or One or 0..1. These symbols are placed near the end of the relationship line to indicate the maximum cardinality.
Step-by-step explanation:
In Crow's Foot E-R diagrams, maximum cardinality is expressed using Crow's Foot notation. This notation uses symbols to represent relationships between entities in a database. There are three symbols used to represent maximum cardinality:
- One or 1 - It indicates that the maximum number of instances of one entity that can be associated with an instance of another entity is one.
- Many or N - It indicates that there can be multiple instances of one entity associated with an instance of another entity.
- Zero or One or 0..1 - It indicates that there can be either zero instances or one instance of one entity associated with an instance of another entity.
These symbols are placed near the end of the relationship line to indicate the maximum cardinality.
For example, a one-to-many relationship between two entities would be represented by placing the 'One' symbol next to the entity at the 'one' end of the relationship, and the 'Many' symbol next to the entity at the 'many' end of the relationship.