Abstract
The features of the Entity-Relationship model are examined, as a means for representing both the conceptual schema and the external schema in a database system. In order to serve in this dual capacity, its modelling features are extended to support multiple user views. We show how to represent a model and present a suitable diagrammatic technique. To represent these concepts at the user level we propose a data definition language with a concise and simple structure. Furthermore, guidelines are given for interfacing the E-E-R schema with existing DBTG-like systems.
Original language | English (US) |
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Pages (from-to) | 139-154 |
Number of pages | 16 |
Journal | Computer Languages |
Volume | 4 |
Issue number | 3-4 |
DOIs | |
State | Published - 1979 |
Funding
work is sponsored in part by NSF Grant MCS77-03904.
Keywords
- Conceptual schema
- Data
- Data abstraction
- Database systems
- Definition language
- External schema
ASJC Scopus subject areas
- General Computer Science