The relational algebra is a procedural query language for relational databases. In this paper
we survey extensions of the relational algebra that can query databases recording time …

This paper provides a systematic and comprehensive study of the underlying semantics of
temporal databases, summarizing the results of an intensive collaboration between the two …

• Bases de datos relacionales (Capítulos 4 al 7). El Capítulo 4 se centra en el lenguaje
relacional orientado al usuario de mayor influencia: SQL. El Capítulo 5 cubre otros dos …

Spatio-temporal databases deal with geometries changing over time. The goal of our work is
to provide a DBMS data model and query language capable of handling such time …

Spatio-temporal databases deal with geometries changing over time. In general, geometries
cannot only change in discrete steps, but continuously, and we are talking about moving …

A temporal database contains time-varying data. In a real-time database transactions have
deadlines or timing constraints. In this paper we review the substantial research in these two …

Schema versioning is one of a number of related areas dealing with the same general
problem—that of using multiple heterogeneous schemata for various database related tasks …

Probability theory is mathematically the best understood paradigm for modeling and
manipulating uncertain information. Probabilities of complex events can be computed from …

Modern movement tracking technologies enable acquisition of high quality data about
movements of the players and the ball in the course of a football match. However, there is a …

This paper describes an efficient optimistic concurrency control scheme for use in distributed
database systems in which objects are cached and manipulated at client machines while …