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Question
Which of the following is true about representing a weak entity with the relational model?A) If the weak entity is existence-dependent, the key of the parent must be part of the key of the weak entity.
B) If the strong entity has a minimum cardinality of 1, the key of the weak entity must be part of the strong entity.
C) If the weak entity is ID-dependent, the key of the weak entity must be part of the key of the parent entity.
D) If the weak entity is ID-dependent, the key of the parent entity must be part of the key of the weak entity.
E) If the parent entity is existence-dependent, then the minimum cardinality of the weak entity is zero.
Answer
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