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I want to identify this ER diagram's strong and weak entities. I doubt that can a strong entity have foreign keys. What are the strong entities and weak entities of this ER diagram?

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Kushani5j
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No, a strong entity can not have a FK as it is independent of any other entity in the schema.

For example, a Booking is a weak entity and a Vehicle type is a strong entity. There could be vehicles Types without any booking made. But you can not have a booking without vehicle type, that makes the booking a weak entity.

The same happens with Vehicle and Vehicles Type

Agustin Pazos
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