Fundamentals of database systems (2nd ed.)
Fundamentals of database systems (2nd ed.)
A consensus glossary of temporal database concepts
ACM SIGMOD Record
Developing time-oriented database applications in SQL
Developing time-oriented database applications in SQL
Temporal Relational Data Model
IEEE Transactions on Knowledge and Data Engineering
IEEE Transactions on Knowledge and Data Engineering
Coalescing in Temporal Databases
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
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A feasible way of implementing a temporal database is by mapping temporal features onto a conventional commercial database management system. In this paper an analysis of different possible ways of implementing coalescing operator of temporal databases by mapping the temporal data model into the underlying relational model followed by Oracle is done. The temporal time-stamps, implicit in the temporal database, are represented as explicit attributes. The advantages of the two methods of implementing coalescing operator in this work are they are based on currently available standards and there is no requirements for making any extensions to the existing standards other than adding explicit attributes for the implicit attributes of the temporal data model. One strategy is based on SQL: 92 standards and another one is based on functions provided by SQL 2003 approach. A comparative study shows the method based on SQL 2003 approach is better in performance than the other method.