several-problems-about-database-management-systems

please finish 8-17, 8-18, 8-19, 8-20 I know those have more same answers online they are valuable and you can reference them but please do not copy them.our textbook as follow:

Modern Database Management, 12/E

Jeffrey A. Hoffer, V. Ramesh, Heikki Topi

ISBN-13: 9780133544770

Thanks.

 

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