If there is a small oval in the crow's foot notation,it means that there might not be any entity.

Name: If there is a small oval in the crow's foot notation,it means that there might not be any entity.
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Quizplus · Accepted Answer

The small oval in the crow's foot notation represents a weak entity, which relies on another entity (known as the strong entity) for its existence. However, if there is no entity at all, then there would be nothing for the weak entity to rely on, and it wouldn't make sense to include it in the diagram.

If There Is a Small Oval in the Crow's Foot