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Update Semantics of Relational Views

... A database view is a portion of the data structured in a way suitable to a specific on views must be translated into updates on the underlying database. This translation process in the relational model. The procedure is as follows: first, a “complete” ...

Publication - erhard - 04/17/2013 - 09:38 - 0 comments - 0 attachments

On lossless tranformation of databases schemes not necessarily satisfying universal instance assumption

... to the original one. This question was addressed in the literature with respect to those relational schemes that satisfy the so ... \"tractable\" We are able to test losslessness defined in such a way for a wide class of relational expressions and dependencies. An ...

Publication - huliganka - 04/17/2013 - 00:27 - 0 comments - 1 attachment

On the computation of relational view complements

... parts of a given data collection play an important role in many database applications. In dynamic environments where data is updated, not only information provided by ...

Publication - cat - 04/16/2013 - 18:16 - 0 comments - 1 attachment

Model-Driven, View-Based Evolution of Relational Databases

... between abstraction levels. There exist several mechanisms in order to carry out propagations from one level to another, that are ... of modifications, is a time–consuming process. In this paper we propose a solution that is closer to the lazy and logical mechanisms, in which changes are delayed or not finally realized, respectively. This ...

Publication - jlloret - 04/16/2013 - 08:49 - 0 comments - 0 attachments

Efficient Maintenance of Temporal Data Warehouses

... the entire history of source databases is not stored in the warehouse; the warehouse keeps enough information for its ... (i.e. non-temporal operators). Although temporal views in V are specified in a temporal algebraic query language we translate them into relational ...

Publication - huliganka - 04/16/2013 - 06:27 - 0 comments - 1 attachment

Evolving the Implementation of ISA Relationships in EER Schemas

... Proceedings of the Workshop on Evolution and Change in Data Management (ECDM 2006), LNCS 4231, pp. 237-246 ... problems related to database evolution is how to reflect in the data level the changes that have occurred in the conceptual schema of ...

Publication - jlloret - 04/16/2013 - 06:05 - 0 comments - 0 attachments