Discussion
If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?
Answer: A
Correct answer: All fields are stored in one relation.
In a one-to-one relationship each row on either side matches at most one on the other, so the two relations can be merged with no duplication of any value. That is why this is the safest case for denormalisation - the join is removed and nothing is repeated in exchange.
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