A foreign key must have unique values in the relation in which it is a foreign key.

Name: A foreign key must have unique values in the relation in which it is a foreign key.
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Quizplus · Accepted Answer

A foreign key does not need to have unique values in the relation in which it is a foreign key; it can contain duplicate values, as its main purpose is to link rows from different tables by referring to the primary key in another table, which must be unique.

A Foreign Key Must Have Unique Values in the Relation