2 Fuzzy Database with FSQL FSQL language is an extension of the SQL language which permits us to write flexible (or fuzzy) conditions in our queries to a fuzzy or traditional database. In this work we present some new fuzzy data types based on time concepts. We extend the existing temporal data types in SQL2 and we give a brief overview of basic definitions in fuzzy temporal databases. In parti...

Schema versioning provides a mechanism for handling change in the structure of database systems and has been investigated widely, both in the context of static and temporal databases. With the growing interest in spatial and spatio-temporal data as well as the mechanisms for holding such data, the spatial context within which data is formatted also becomes an issue. This paper presents a genera...

Visual object database browsers are essentially based on two kinds of interactions: navigation within a collection of objects, and navigation between objects via their relationships. These two interactional operators have proven to adequately support the main user task addressed by these tools, i.e. exploring the states of a set of related objects. In temporal object databases, visual browsing ...

Temporal aggregation is an important but costly operation for applications that maintain time-evolving data (data warehouses, temporal databases, etc.). In this paper we examine the problem of computing temporal aggregates over data streams. Such aggregates are maintained using multiple levels of temporal granularities: older data is aggregated using coarser granularities while more recent data...

This paper describes a new architecture for a system to handle temporal data, called Temporal Data Management System, TDMS. TDMS represents an approach to the modelling of temporal semantics which is pragmatic because it takes into account practical issues such as the time /space trade-offs. We consider the technical aspects of the system i.e. how time domain data is managed in TDMS. The design...

This chapter is devoted to architectural and implementation aspects of spatiotemporal database management systems. It starts with a general introduction into architectures and commercial approaches to extending databases by spatiotemporal features. Thereafter, the prototype systems Concert, Secondo, Dedale, Tiger, and GeoToolKit are presented. As we will see, the focus of these systems is on di...

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