If an identifier is not assigned, the default primary key for an associative relation consists of the two primary key attributes from the other two relations.

Name: If an identifier is not assigned, the default primary key for an associative relation consists of the two primary key attributes from the other two relations.
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In an associative relation, if no identifier is assigned, the default primary key is typically a composite key made up of the primary keys from the two related entities.

If an Identifier Is Not Assigned, the Default Primary Key