X abcefg xyz feg xyz abcdefg Y 1 2 3 2 Z q Р 9 P q A 10 11 12 13 10 Find out which of the following dependencies are valid or invalid. For each dependency, briefly write the reasons. A. X-> YZ B. X-> 7 C. XY -> A D. A-> XYZ E. YZ -> X

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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X
abcefg
xyz
feg
xyz
abcdefg
Y
1
2
3
2
3
Z
q
Р
q
Р
q
A
10
11
12
13
10
Find out which of the following dependencies are valid or invalid. For each dependency, briefly
write the reasons.
A. X -> YZ
B. X-> Z
C. XY -> A
D. A -> XYZ
E. YZ -> X
Transcribed Image Text:X abcefg xyz feg xyz abcdefg Y 1 2 3 2 3 Z q Р q Р q A 10 11 12 13 10 Find out which of the following dependencies are valid or invalid. For each dependency, briefly write the reasons. A. X -> YZ B. X-> Z C. XY -> A D. A -> XYZ E. YZ -> X
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