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Database Management Elasticsearch Objective
May 10, 2013

Which of these are rules for foreign keys in realitional theory.

Choose the correct answer:
A) a foreign key always affects how realitional data is distruibutted.
B) A Foreign key value may be non-unique.
C) A Foreign key must exists as a primary key in realted table.
D) A table must have one, and only one,foreign key.
Detailed Explanation

Option C is the right answer.

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