Objectif The main objective of this proposal is to study the storage of constraints in databases, the use of constraint handling techniques in database query and update, and the incorporation of constraints in object data modelling and database specification. The recent success of the constraint-based programming paradigm is based on the direct contribution of constraints to program specification, implementation and maintenance. Constraints are the normal language of discourse for many high-level applications; built-in constraint solvers and active constraints contribute to efficient implementation; and the clarity and brevity of constraint programs simplify program maintenance.ACTIVITIES The formal properties of constraints in databases and database queries will be studied; their role in query optimisation; the consequences of stored constraints on database indexing; constraints on stored objects; and the relationship between active constraints and integrity constraints. On the practical side, the focus is on supporting the decision making process by the application of constraint handling techniques to large scale geographical data bases. The techniques will also be applied to commercially motivated problems of scheduling and tutoring. It is planned to use the working group to build a long-lasting European Interest Group which will drive and exploit continuing research and development in the field of Constraint Databases. Through regular workshops, it is hoped to attract representatives of European industry and the public sector, as well as the academic community. POTENTIAL We seek to lay the foundations for a technology with considerable market potential. Within Europe there is a firmly established need for systems supporting complex information and decision making. We identify in particular: the aerospace industry; earth observation; air and ground transportation control; telecommunications network planing and signal routing; town and environmental planning; and production, maintenance and servicing in manufacturing. Champ scientifique sciences naturellesinformatique et science de l'informationbases de donnéesingénierie et technologiegénie électrique, génie électronique, génie de l’informationingénierie de l’informationtélécommunicationréseau de télécommunications Programme(s) FP3-ESPRIT 3 - Specific research and technological development programme (EEC) in the field of information technologies, 1990-1994 Thème(s) Data not available Appel à propositions Data not available Régime de financement Data not available Coordinateur European Computer-Industry Research Centre GmbH Adresse Arabellastraße 17 81925 München Allemagne Voir sur la carte Contribution de l’UE Aucune donnée Participants (6) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire HUMBOLDT UNIVERSITAET ZU BERLIN Allemagne Contribution de l’UE € 0,00 Adresse Unter den linden 6 Berlin Voir sur la carte Liens Site web Opens in new window Autres sources de financement Aucune donnée Humboldt-Universität zu Berlin Allemagne Contribution de l’UE € 0,00 Adresse Spandauerstraße 1 10178 Berlin Voir sur la carte Autres sources de financement Aucune donnée National Technical University of Athens Grèce Contribution de l’UE € 0,00 Adresse Heroon polytechniou 9 15773 Zographou, athens Voir sur la carte Autres sources de financement Aucune donnée PARIS RESEARCH LABORATORY DIGITAL EQUIPMENT France Contribution de l’UE € 0,00 Adresse 85 avenue victor hugo 92563 Rueil-malmaison Voir sur la carte Autres sources de financement Aucune donnée TECHNICAL UNIVERSITY VIENNA Autriche Contribution de l’UE € 0,00 Adresse Gusshausstrasse, 27/29 1040 Wien Voir sur la carte Autres sources de financement Aucune donnée UNIVERSITY OF TWENTE Pays-Bas Contribution de l’UE € 0,00 Adresse Drienerlolaan, 217 7500 AE Enschede Voir sur la carte Autres sources de financement Aucune donnée
