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Extended Entity Relationship Modeling

Extended Entity Relationship Modeling

Sikha Bagui
Copyright: © 2005 |Pages: 7
ISBN13: 9781591405603|ISBN10: 1591405602|EISBN13: 9781591407959
DOI: 10.4018/978-1-59140-560-3.ch040
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MLA

Bagui, Sikha. "Extended Entity Relationship Modeling." Encyclopedia of Database Technologies and Applications, edited by Laura C. Rivero, et al., IGI Global, 2005, pp. 233-239. https://doi.org/10.4018/978-1-59140-560-3.ch040

APA

Bagui, S. (2005). Extended Entity Relationship Modeling. In L. Rivero, J. Doorn, & V. Ferraggine (Eds.), Encyclopedia of Database Technologies and Applications (pp. 233-239). IGI Global. https://doi.org/10.4018/978-1-59140-560-3.ch040

Chicago

Bagui, Sikha. "Extended Entity Relationship Modeling." In Encyclopedia of Database Technologies and Applications, edited by Laura C. Rivero, Jorge Horacio Doorn, and Viviana E. Ferraggine, 233-239. Hershey, PA: IGI Global, 2005. https://doi.org/10.4018/978-1-59140-560-3.ch040

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Abstract

With the rising complexity of database applications, the basic concepts of Entity-Relationship (ER) modeling (as originally developed by Chen, 1976) were no longer sufficient. So the basic ER model was extended to include generalizations and specializations (Bagui & Earp, 2003; Elmasri & Navathe, 2003) and the concept of categories (Elmasri, Weeldreyer & Hevner, 1985). An ER model which includes all the concepts of the original ER model and the additional concepts of generalizations/specializations and categories is often referred to as the Extended ER (EER) model (Elmasri & Navathe, 2003). In this short paper, we shed some light on these relationship concepts, concepts that database designers often find difficult to model directly (Engels et al., 1992/1993). We also discuss the mapping rules for generalizations/specializations and categories. Important contributions in this area are also reported in (Elmasri et al., 1985; Markowitz & Shoshani, 1992; Dey, Storey & Barron, 1999; Wiederhold & Elmasri, 1980). Song, Evans, and Park (1995) also give a good comparative analysis of other types of ER diagrams and their notations.

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