Show that each of the following are not valid rules about FDs by giving example relations that
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Question:
Show that each of the following are not valid rules about FD’s by giving example relations that satisfy the given FD’s (following the “if”) but not the FD that allegedly follows (after the “then”).
a) If A → B then B → A .
b) If AB → C and A → C , then B → C .
c) If AB → C , then A → C or B → C .
Related Book For
Elementary Statistics
ISBN: 978-0538733502
11th edition
Authors: Robert R. Johnson, Patricia J. Kuby
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