Preserving Relationship Cardinality Constraints in Relational Schemata

Preserving Relationship Cardinality Constraints in Relational Schemata

Dolores Cuadra (Universidad Carlos III de Madrid, Spain), Carlos Nieto (Universidad Carlos III de Madrid, Spain), Paloma Martinez (Universidad Carlos III de Madrid, Spain), Elena Castro (Universidad Carlos III de Madrid, Spain) and Manuel Velasco (Universidad Carlos III de Madrid, Spain)
Copyright: © 2002 |Pages: 47
DOI: 10.4018/978-1-930708-38-9.ch003
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Abstract

This chapter is devoted to the study of the transformation of conceptual into logical schemata in a methodological framework focusing on a special ER construct: the relationship and its associated cardinality constraints. The section entitled “EER Model Revised: relationships and cardinality constraint” reviews the relationship and cardinality constraint constructs through different methodological approaches to establish the cardinality constraint definition that will be followed in next sections. The section “Transformation of EER Schemata into Relational Schemata” is related to the transformation of conceptual n-ary relationships (n³2) into the relational model following an active rules approach. Finally, several practical implications as well as future research paths are presented.

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