An entity is like a unique object and a set of attributes. Talking about the types of entities, we have a strong entity and a weak entity. A strong entity is independent, whereas a weak entity is reliant on another entity. Let’s explore more differences between a strong and weak entity.
What is a Strong Entity?
A strong entity is an entity that is not dependent on any other entity. It has a primary key, or a table includes a primary key.
What is a Weak Entity?
Unlike a strong entity, a weak entity is not independent as it is reliant on another strong entity. It has to rely on other entities to ensure its existence.
Difference between Strong and Weak Entity
| S.No. | Strong Entity | Weak Entity |
| 1 | It is independent in nature. | It depends on another strong entity. |
| 2 | It has a primary key. | It does not have any primary key. |
| 3 | It is depicted by a sole rectangle. | It is depicted by a dual rectangle. |
| 4 | The connection between two strong entities is shown by a sole diamond. | The connection between a weak and a strong entity is shown by a dual diamond. |
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