Consider a relation R with six attributes A, B, C,D, E, and F. The following functionaldependencies hold: AB → C, B → D, AD → F, C →D, D → E, E → F, F→ D. The number of superkeys of R₁ (DEF) is

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Engineering

Computer Science

six attributes A, B, C, unctional CR→DADFC-

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 a relation R with six attributes A, B, C,
D, E, and F. The following functional
dependencies hold: AB → C, B → D, AD → F, C →
D, D → E, E → F, F→ D. The number of super
keys of R₁ (DEF) is

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