Database Concepts

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

Chapter 2 - The Relational Model - Review Questions - Page 107: 2.22


An example of null value would be: Null value for the attribute DeceasedDate in the table SUBSCRIBER. - The subscriber may be a corporation and a value is inappropriate. - The subscriber may be alive, and the value is known to be blank. - The subscriber may be dead, but the date of death is unknown, and the value is appropriate, but not none.

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