Each instance of a weak entity must participate in one instance of the identifying relationship.

Question

Quizplus · Accepted Answer

This is a characteristic of a weak entity in an ER diagram. The identifying relationship connects the weak entity to its parent entity through its partial key, which is composed of its own attributes and the primary key of the parent entity. Each instance of the weak entity must have a corresponding instance of the identifying relationship to properly identify and link it with its parent entity.

Each Instance of a Weak Entity Must Participate in One