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! 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.

! 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.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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! 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.
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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