Question

Compare strenge entity and week entity.​

Answer 1

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Answer 2

Answer:

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Explanation:

Strong Entity:

A strong entity is not dependent of any other entity in the schema. A strong entity will always have a primary key. Strong entities are represented by a single rectangle. The relationship of two strong entities is represented by a single diamond.

Various strong entities, when combined together, create a strong entity set.

Weak Entity:

A weak entity is dependent on a strong entity to ensure the its existence. Unlike a strong entity, a weak entity does not have any primary key. It instead has a partial discriminator key. A weak entity is represented by a double rectangle.

The relation between one strong and one weak entity is represented by a double diamond.