Discussion
In a 1:1 relationship, the foreign key is placed in:
Answer: A
Correct answer: either table without specifying parent and child tables.
In a one-to-one relationship each row on either side matches at most one on the other, so a single foreign key column serves whichever table it is placed in. There is no many side to force the choice, and the decision is made on practical grounds - which table is more often queried, or which participation is optional.
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