EXAPTER ENDAPTER · WORKING ARTIFACT

How Strong is the Entity?

Judge the entity by its identity. Read the business rule and the identifier before choosing strong or weak.

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Ask: Can the target entity be identified independently?

Strong entityIts own complete identifier establishes its identity. A relationship or foreign key does not change that.

Weak entityA local identifier is incomplete until combined with an identifying owner's identifier.

Separate the two questions.Entity strength asks about independent identity. Relationship strength asks whether the parent's PK joins the child's PK. Weak describes identification dependence, not importance.

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