
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:! Exercise 3.2.4: 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.
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