Logical Data Modeling - Relationship Degree (Arity)
Table of Contents
1 - About
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