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

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

Problem 1PE

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Concept explainers

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.

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Please do not provide a step-by-step answer.

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abcefg
xyz
feg
xyz
abcdefg
Y
1
2
3
2
3
Z
q
Р
q
Р
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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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