Which of the following key constraints is required for the functioning of the foreign keys in the context of a relational database?
(A) Unique Key
(B) Primary Key
(C) Candidate Key
(D) Check key
Answer: (B)
Explanation: A foreign key is a key whose values depend on the primary key of a relation. So for the functioning of a foreign key in the context of a relational database we need a primary key.
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