The relation R(A, B, C, D, E) has the following functional dependencies. А, В - С В, С -> D C, D→E D, E A (a) What are all of the keys of R? (b) Find a lossless-join decomposition of R into BCNF relations. (c) Find a lossless-join decomposition of R into 3NF relations.

The relation R(A, B, C, D, E) has the following functional dependencies. А, В - С В, С -> D C, D→E D, E A (a) What are all of the keys of R? (b) Find a lossless-join decomposition of R into BCNF relations. (c) Find a lossless-join decomposition of R into 3NF relations.

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

The relation R(A, B, C, D, E) has the following functional dependencies.
А, В -> С
В, С — D
C, D→E
D, E → A
(a) What are all of the keys of R?
(b) Find a lossless-join decomposition of R into BCNF relations.
(c) Find a lossless-join decomposition of R into 3NF relations.

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