Which of the following statements is correct? a. A foreign key of a relation A cannot refer

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Which of the following statements is correct?

a. A foreign key of a relation A cannot refer to the primary key of the same relation

A. b. A relation cannot have more than one foreign key.

c. Every relation must have a foreign key.

d. A foreign key can be NULL.

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Principles Of Database Management The Practical Guide To Storing Managing And Analyzing Big And Small Data

ISBN: 9781107186125

1st Edition

Authors: Wilfried Lemahieu, Seppe Vanden Broucke, Bart Baesens

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Question Posted: Dec 18, 2023 01:32 AM

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Which of the following statements is correct? a. A foreign key of a relation A cannot refer

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d A foreign key can be NULL Among the given statements option d is the co...View the full answer

Principles Of Database Management The Practical Guide To Storing Managing And Analyzing Big And Small Data

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