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Cardinality in an Entity - Relationship diagram refers to the number of higher level entities that are used in the ER model. is used to
Cardinality in an EntityRelationship diagram
refers to the number of higher level entities that are used in the ER model.
is used to show the order of the relationships between two entities, ie a many
relationship always precedes a one relationship.
is used to show the average number of items that might typically be involved in a relationship, eg the average number of children a family might have or the average number of employees per department in a company.
gives the count of the number of entities involved in a single relationship.
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