强和弱实体类型的示例 [英] Example of a strong and weak entity types

问题描述

我尝试在Google上查看弱和强实体类型的正确解释，但我还没有完全理解它们。

I've tried to look on Google about a decent explanation of weak and strong entity type, but I haven't fully understood them.

有人可以给我一个强而弱的实体类型的例子吗？

Could someone give me an example of a strong and weak entity type?

推荐答案

弱实体是只有当另一个拥有时才存在的实体。例如：ROOM只能存在于BUILDING中。另一方面，TIRE可以被认为是一个强大的实体，因为它也可以存在而不附加到CAR。

A weak entity is one that can only exist when owned by another one. For example: a ROOM can only exist in a BUILDING. On the other hand, a TIRE might be considered as a strong entity because it also can exist without being attached to a CAR.

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