Consider the relation schema R=VWXYZ, with the set of functional dependencies F = {VW->XY, V->X, W->z, YZ->Z, Z->V} А. Give three independent reasons why the following table cannot possibly legal instance of R. V W v1 x1 yl x2 y2 х1 z2 y2 w1 z1 v2 w1 z1 v2 w2

Consider the relation schema R=VWXYZ, with the set of functional dependencies F = {VW->XY, V->X, W->z, YZ->Z, Z->V} А. Give three independent reasons why the following table cannot possibly legal instance of R. V W v1 x1 yl x2 y2 х1 z2 y2 w1 z1 v2 w1 z1 v2 w2

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

Problem 1PE

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Question

Consider the relation schema R=VWXYZ,
with the set of functional dependencies F = {VW->XY, V->X, W->Z, YZ→Z, Z->V}
А.
Give three independent reasons why the following table cannot possibly be a
legal instance of R.
V
W
Z
yl
x2
X
Y
v1
w1
х1
z1
_y2
x1
v2
w1
z1
v2
w2
y2
z2

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