Authors: | Doberkat, Ernst-Erich Omodeo, Eugenio G. |
Title: | ER modelling from first relational principles |
Language (ISO): | en |
Abstract: | Entity-Relationship modelling is a popular technique for data modelling. Despite its popularity and wide spread use, it lacks a firm semantic foundation. We propose a translation of an ER-model into relation algebra, suggesting that this kind of algebra does provide suitable mechanisms for establishing a formal semantics of Entity-Relationship modelling. The work reported on here deals first with the techniques necessary for the translation, thus constructing a static view of an ER-model in an abstract setting of what might be called logic without variables. We then undertake a detailed analysis of the insertion and deletion operations for an ER-model represented in terms of the relation calculus. |
Subject Headings: | Entity-Relationship models (static and dynamic view) relational foundations of data modelling. relation algebra |
URI: | http://hdl.handle.net/2003/2679 http://dx.doi.org/10.17877/DE290R-16053 |
Issue Date: | 2003-04-28 |
Provenance: | Universität Dortmund |
Appears in Collections: | LS 10 Software-Technologie |
Files in This Item:
File | Description | Size | Format | |
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er_modelling.pdf | DNB | 414.56 kB | Adobe PDF | View/Open |
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