Discussion
When mapping a multivalued attribute into a relation which of the following is true?
Answer: B
Correct answer: Two relations are created.
A multivalued attribute cannot be held in a single-valued column, so it is placed in a relation of its own together with the key of the entity it belongs to. That gives two relations: the entity and the attribute’s, joined by the foreign key - and it is exactly what first normal form requires.
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