Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 7, Problem 22E

Explanation of Solution

Lossless, dependency preserving decomposition of schema “R” into third Normal Form (3NF):

  • Let schema R=(A,B,C,D,E) has been decomposed into (A,B,C) and (D,E,F).
  • To decompose relation schema into 3NF, a canonical cover is used.
  • The designs which are both lossless and dependency preserving can be produced by this algorithm.
  • This algorithm is given in the Figure 7.12 of the textbook.
  • The four functional dependencies given in the question forms a canonical cover.
  • To get the relation (A,B,C) , use the functional dependency ABC.
  • Get the relation (C,D,E) from functional dependency CDE

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