Database Concepts

Published by Pearson
ISBN 10: 0133544621
ISBN 13: 978-0-13354-462-6

Chapter 2 - The Relational Model - Review Questions - Page 107: 2.27


A -> (B, C) is just shorthand for A -> B and A -> C However, (D, E) -> F means that the composite, as a whole, identifies F. For example: EmployeeNumber -> (FirstName, LastName) This means that EmployeeNumber -> FirstName and that EmployeeNumber -> LastName. But: (FirstName, LastName) -> HireDate does not mean that FirstName -> HireDate (There could be lots of employees named “Bob”.)

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