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association mapping

unidirectional-association: 단방향 연관관계

one-to-many

one-to-many-unidirectional: 일대다 단방향[1:N] -> 단점 존재(대안: 다대일 양방향 매핑을 활용)

many-to-many

many-to-many-unidirectional: 다대다 단방향 -> 한계 존재
many-to-many-bidirectional: 다대다 양방향 -> 한계 존재
alternative-many-to-many: 다대다 양방향 한계 극복

value object

value-object-collection: 값 타입 컬렉션 -> 제약사항 존재
alternative-value-object-collection: 값 타입 컬렉션 대안(일대다 관계 활용)

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