Fuzzy constraints using the Enhanced Entity-Relationship model

被引：2
|
作者：
Galindo, J [1 ]
Urrutia, A [1 ]
Carrasco, RA [1 ]
Piattini, M [1 ]
机构：
[1] Univ Malaga, Dpto Lenguajes & Ciencias Computat, E-29071 Malaga, Spain
来源：
SCCC 2001: XXI INTERNATIONAL CONFERENCE OF THE CHILEAN COMPUTER SCIENCE SOCIETY, PROCEEDINGS | 2001年
关键词：
conceptual database design; fuzzy conceptual modeling; fuzzy constraints; Extended (or Enhanced) Entity-Relationship Model; fuzzy databases;
D O I：
10.1109/SCCC.2001.972636
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
In this article(1) our aim is to relax the constraints which can be expressed in a conceptual model using the Enhanced Entity Relationship modeling tool, so that these constraints can be made more flexible. To do so we will use the fuzzy quantifiers which have been widely studied in the context of fuzzy sets and of fuzzy consultation systems for databases. We will also examine the representation of these constraints in an EER model and their practical repercussions. The constraints proposed are as follows: fuzzy participation constraint, fuzzy cardinality constraint, fuzzy completeness constraint in the representation of classes, sub-classes (and categories or union types) and fuzzy cardinality constraint in overlapping specialization. We also demonstrate how fuzzy (min, max) notation can substitute fuzzy cardinality constraint. All these fuzzy, constraints have a novel meaning and offer greater expressiveness in conceptual design.
引用
收藏
页码：86 / 94
页数：9
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