Explain why primary keys may never be null, but alternate keys can be null.
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Explain why primary keys may never be null, but alternate keys can be null.
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Primary keys can never be null since each row must have a uniqu...View the full answer
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Related Book For 
Database Processing Fundamentals, Design, and Implementation
ISBN: 978-0133876703
14th edition
Authors: David M. Kroenke, David J. Auer
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