When modeling a many-to-many unary relationship, the primary key of the relation representing the relationship is always singular.

Name: When modeling a many-to-many unary relationship, the primary key of the relation representing the relationship is always singular.
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In a many-to-many unary relationship, the primary key of the relation representing the relationship is typically composite, consisting of multiple attributes to uniquely identify each association between entities.

When Modeling a Many-To-Many Unary Relationship, the Primary Key of the Relation