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The Computer Journal 1988 31(3):258-268; doi:10.1093/comjnl/31.3.258
© 1988 by British Computer Society
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From Entity-relationship Diagrams to Fourth Normal Form: A Pictorial Aid to Analysis

K. S. Dawson and L. M. Purgailis Parker *

Department of Mathematical Sciences, Virginia Commonwealth University, Richmond, Virginia 23284-2014, USA

The analysis of a relational database to reduce its component schemes into fourth normal form is not trivial. Decompositions into Boyce–Codd normal form is not difficult, but the concepts and analysis needed to further decompose into fourth normal form are usually difficult to comprehend and use. A diagrammatic representation of dependencies is described which provides an informal aid to the construction of relational schemes in fourth normal form.

Received September 1986. revised February 1987.

* To whom correspondence should be addressed.

§ Department of Mathematical Sciences, Virginia Commonwealth University, Richmond, Virginia 23284-2014, U.S.A.


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