An M:N relationship is different from 1:1 or 1:M relationships because the event or transaction that links the two entities is actually a third entity,called an associative entity,that has its own characteristics.

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In an M:N relationship, there is a third entity, called an associative entity, that links the two entities together. This is different from 1:1 or 1:M relationships where there is a direct link between the entities without the need for an associative entity.

An M:N Relationship Is Different from 1:1 or 1:M Relationships