What is a weak entity in an ER model?
Correct Answer: A weak entity is one that cannot exist without a strong entity.
- Step 1: Understand that an entity is something that can be identified, like a person or a car.
- Step 2: Know that a strong entity can exist on its own, meaning it has its own unique identifier (like an ID number).
- Step 3: Learn that a weak entity is different because it cannot exist by itself; it needs a strong entity to help identify it.
- Step 4: Realize that a weak entity usually has a partial key, which means it needs the strong entity's key to be fully identified.
- Step 5: For example, think of a 'Room' as a weak entity that needs a 'Building' (strong entity) to be identified, like 'Room 101 in Building A'.
No concepts available.
