Answer
Three possible interpretations of NULL value are:
a. Does not exist
b. Exist but not known
c. No value is appropriate therefore, cannot be assigned a value
Work Step by Step
No steps
Database Concepts
by Kroenke, David; Auer, David;
Published by
Pearson
ISBN 10:
0133544621
ISBN 13:
978-0-13354-462-6
Chapter 2 - The Relational Model - Review Questions - Page 107: 2.21
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