What is a Join operation? What is meant when it is said that two relations are join

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What is a Join operation? What is meant when it is said that two relations are join compatible? What is the difference between an Inner Join operation and an Outer Join operation?
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Data Modeling and Database Design

ISBN: 978-1285085258

2nd edition

Authors: Narayan S. Umanath, Richard W. Scammel

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