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What is a weak entity in an ER model?
What is a weak entity in an ER model?
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Practice Questions
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Q1
What is a weak entity in an ER model?
An entity that cannot exist without a strong entity
An entity with no attributes
An entity that has a composite key
An entity that is not related to any other entity
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A weak entity is one that cannot exist without a strong entity.
Questions & Step-by-step Solutions
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Q
Q: What is a weak entity in an ER model?
Solution:
A weak entity is one that cannot exist without a strong entity.
Steps: 5
Show Steps
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'.
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