composite relationship

A composite relationship is a relationship between two tables in which each feature in the is expected to be related to an . In other words, any orphan destination features are considered a violation of the relationship. For example, a building and its mailbox must be related. While the building (origin) can exist on its own, a mailbox (destination) must be related to a building. When an origin feature is deleted, the destination feature should also be deleted. This is known as a cascade delete. Also see .

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