What is a foreign key? Why are foreign keys used or required in a relational database? Are

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What is a foreign key? Why are foreign keys used or required in a relational database? Are duplicate foreign key values allowed? Why or why not?

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Systems analysis and design in a changing world

ISBN: 978-1423902287

5th edition

Authors: John W. Satzinger, Robert B. Jackson, Stephen D. Burd

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