What is the purpose of a foreign key in the context of data integrity? Please provide an example of when this could be useful.

A Guide to SQL
9th Edition
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Philip J. Pratt
Chapter7: Database Administration
Section: Chapter Questions
Problem 22RQ
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What is the purpose of a foreign key in the context of data integrity?
Please provide an example of when this could be useful.
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