Discussion
Whenever two independent one-to-many relationships are mixed in the same relation, a __________ arises.
Answer: B
Correct answer: Multi-valued dependency
If one key has two independent one-to-many relationships in the same table, every combination of the two sets of values must be stored, and the two sets are unrelated to each other. That is a multi-valued dependency, and removing it is what fourth normal form is for.
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