Consider the relation schema R=VWXYZ,with the set of functional dependencies F = {VW->XY, V>X, W->Z, YZ->Z, Z→V}A. Give three independent reasons why the following table cannot possibly be a legal instanceof R.VWXYv1w1х1ylz1v2w1x2y2z1v2w2x1y2z2B. Show the functional dependencies that hold on each of R1=VWX and R2=WYZ. You do notneed to show trivial functional dependencies, or those implied by others in the same set, butyou must show all others.C. Is the decomposition of R into R1=VWX and R2=WYZ lossless-join? Why or why not?

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

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

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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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

Consider the relation schema R=VWXYZ,
with the set of functional dependencies F = {VW->XY, V>X, W->Z, YZ->Z, Z→V}
A. Give three independent reasons why the following table cannot possibly be a legal instance
of R.
V
W
X
Y
v1
w1
х1
yl
z1
v2
w1
x2
y2
z1
v2
w2
x1
y2
z2
B. Show the functional dependencies that hold on each of R1=VWX and R2=WYZ. You do not
need to show trivial functional dependencies, or those implied by others in the same set, but
you must show all others.
C. Is the decomposition of R into R1=VWX and R2=WYZ lossless-join? Why or why not?

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