databaseuml
Multiplicity vs Cardinality
When talking about data models and databases, the term Cardinality is often used to describe the number of allowed elements in a given set.
UML often refers to the same property as Multiplicity.
Is there any difference between these two terms or are they synonymous?
Solution
The simplest explanation would be to say:
Multiplicity = Cardinality + Participation
Cardinality: Denotes the maximum number of possible relationship
occurrences in which a certain entity can participate in (in simple terms: at most).
Participation: Denotes if all or only some entity occurrences participate in a relationship (in simple terms: at least).
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