An entity and its 1:1 unary relationship are mapped as one relation.

Name: An entity and its 1:1 unary relationship are mapped as one relation.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

In a 1:1 unary relationship, an entity is related to itself in a one-to-one manner. This relationship can be represented as a single relation by adding the foreign key of the entity to its own relation. Therefore, the entity and its 1:1 unary relationship can be mapped as one relation.

An Entity and Its 1:1 Unary Relationship Are Mapped as One