Which of the following statements about weak entities are true?Group of answer choicesA weak entity is represented by a dashed underline in a Chen's notation modelA weak entity generally participates in a one-to-many relationship with its owner entityA weak entity does not have an identifierA weak entity is identified in terms of another entity
Question
Which of the following statements about weak entities are true?Group of answer choicesA weak entity is represented by a dashed underline in a Chen's notation modelA weak entity generally participates in a one-to-many relationship with its owner entityA weak entity does not have an identifierA weak entity is identified in terms of another entity
Solution 1
The following statements about weak entities are true:
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A weak entity is represented by a dashed underline in a Chen's notation model: This statement is False. In Chen's notation, a weak entity is represented by a double rectangle, not a dashed underline.
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A weak entity generally participates in a one-to-many relationship with its owner entity: This statement is True. A weak entity is always dependent on a strong entity (its owner entity) and generally participates in a one-to-many relationship with it.
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A weak entity does not have an identifier: This statement is False. A weak entity does not have a unique identifier of its own, but it does have a partial identifier, which in combination with the identifier of its owner entity, uniquely identifies it.
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A weak entity is identified in terms of another entity: This statement is True. A weak entity is always identified by its relationship with a strong (owner) entity.
Solution 2
The following statements about weak entities are true:
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A weak entity is represented by a dashed underline in a Chen's notation model: This statement is False. In Chen's notation, a weak entity is represented by a double rectangle, not a dashed underline.
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A weak entity generally participates in a one-to-many relationship with its owner entity: This statement is True. A weak entity is always dependent on a strong entity (its owner entity) and usually participates in a one-to-many relationship with it.
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A weak entity does not have an identifier: This statement is False. A weak entity does not have a unique identifier of its own, but it does have a partial identifier, which is combined with the identifier of its owner entity to create a unique identifier.
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A weak entity is identified in terms of another entity: This statement is True. A weak entity is identified by being related to specific instances of another entity, which is known as its owner entity.
Solution 3
The following statements about weak entities are true:
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A weak entity is represented by a dashed underline in a Chen's notation model: This statement is False. In Chen's notation, a weak entity is represented by a double rectangle, not a dashed underline.
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A weak entity generally participates in a one-to-many relationship with its owner entity: This statement is True. A weak entity is always dependent on a strong entity (its owner entity) and generally participates in a one-to-many relationship with it.
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A weak entity does not have an identifier: This statement is False. A weak entity does not have a unique identifier of its own, but it does have a partial identifier, which in combination with the identifier of its owner entity, uniquely identifies it.
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A weak entity is identified in terms of another entity: This statement is True. A weak entity is always identified by its relationship with a strong (owner) entity.
Similar Questions
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What is a weak entity in the context of the Entity-Relationship model?An entity with a strong relationshipAn entity without any attributesAn entity that cannot be uniquely identified by its own attributes aloneAn entity with a primary key
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