An algebra for a temporal object data model
| Autor: | Lichun Wang, M. Wing, Norman Revell, C. Davis |
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| Rok vydání: | 1996 |
| Předmět: |
Hierarchy
Theoretical computer science Computer science Semi-structured model InformationSystems_DATABASEMANAGEMENT Relational algebra Object (computer science) Database design Algebra Inheritance (object-oriented programming) Data model Algebraic operation Object model Logical data model Computer Science::Databases Database model |
| Zdroj: | Lecture Notes in Computer Science ISBN: 9783540616566 DEXA |
| DOI: | 10.1007/bfb0034720 |
| Popis: | In this paper, we present a temporal object data model, which has been adapted from the unified model of OODB and RDB in UniSQL/X so that a time dimension can be easily added to form temporal relational-like cubes but with aggregation and inheritance hierarchies. A query algebra, that accesses objects through the associations of aggregation, inheritance and time-reference, is thereby defined. Due to the adaptation of the unified model of RDB and OODB, the temporal object data model supports both homogeneity and heterogeneity in the time dimension, and the algebra reflects the spirit of both temporal relational algebra and object algebra. Data query examples through “The Wood Panel Deformation Measurement Database” illustrate algebraic operations and a brief evaluation of algebra has been given. |
| Databáze: | OpenAIRE |
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