Logical Data Modeling - Relationship Degree (Arity)

Data System Architecture


The degree of a relationship is the number of entities that participate in the relationship.

A binary relationship has a degree = 2, because two different entities participated in the relationship

Relationships may also exist between different instances (row) of the same entity. This is called a recursive relationship

A relationship may be:

  • binary (concerns only two elements)
  • or multinary (concerns more than two elements) (ie a+b=c)

Same concept than Function - Arity

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A data model in software engineering is a graph of entity that try to represent the reality and describes how data are represented and accessed. the real world consists of entities and relationships....
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A relationship is a model element that relates two entities . In its simple form (semantic form), it's a description that has a verb such as: has consists of uses ... entityentity setrelationship...

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