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In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many side.

  • A.True
  • B.False

Answer: A

Correct answer: True

A one-to-many relationship is represented by placing the primary key of the one side into the many side as a foreign key. It cannot go the other way: the one side would need to hold many values, which first normal form forbids. This is the commonest mapping rule of all.

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