Discussion
When mapping a many-to-many unary relationship into a relation which of the following is true?
Answer: B
Correct answer: Two relations are created.
A unary many-to-many relationship - a part composed of other parts, an employee supervising employees - needs the entity’s own relation plus an associative relation holding pairs of its key. The associative relation’s key is the two roles taken together, each a foreign key to the same relation.
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