Suppose that we decompose the schema R = (A, B, C, D, E) into (A, B, C) (A, D, E). Show that this decomposition is a lossless decomposition if the following set F of functional dependencies holds: A → BC CD-E B-D E → A

Suppose that we decompose the schema R = (A, B, C, D, E) into (A, B, C) (A, D, E). Show that this decomposition is a lossless decomposition if the following set F of functional dependencies holds: A → BC CD-E B-D E → A

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

Give a lossless, dependency-preserving decomposition into 3NF of schema R of

Exercise 7.1.

7.1 Suppose that we decompose the schema R = (A, B, C, D, E) into
(A, B, C)
(A, D, E).
Show that this decomposition is a lossless decomposition if the following set F
of functional dependencies holds:
A → BC
CD->
→E
B→ D
E → A

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