On Non-Constrained, Constrained and Mandatory Many-to-Many Relationship Types

On Non-Constrained, Constrained and Mandatory Many-to-Many Relationship Types

Peretz Shoval (Ben-Gurion University of the Negev, Israel)
Copyright: © 1993 |Pages: 13
DOI: 10.4018/jdm.1993010101
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Abstract

The purpose of a data model is to express the semantics of the real world that it models. One common situation that should be modeled is that of many-to-many relationships between objects (entities). In this paper we distinguish between three different types of m:n relationships: non-constrained, constrained and mandatory. Their meaning and consequences are discussed along with examples from entityrelationship (ER), binary-relationship (BR) and relational models. These refined m:n relationship types bring to light additional semantics, thereby facilitate analysis and representation of the data structure.

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