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This volume collects selected contributions on the application of heterogeneous methods for managing uncertainty and imprecision in databases. It contains both survey chapters on classic topics such as "flexible querying in databases", and up to date ontributions on "database models to represent imperfect data". Further, it includes specific contributions on uncertainty management in database integration, and in representing and querying semistructured and spatial data. These topics are of particular relevance nowadays with the diffusion of the internet since, most of the time, applications require information spread across several information sources and their integration may result in inconsistent information. Semistructured information querying often calls for the application of approximate matching techniques, and spatial information is often incomplete and imprecise. Reading this volume can serve as a guide to students for having a panoramic view of the methods to manage uncertainty and imprecision in databases proposed so far, to researchers to focus on the most up to date research trends, and to practitioners for having examples in which current databases incorporate flexible functionalities for the management of uncertainty and imprecision.

Mathematics --- Engineering sciences. Technology --- Information systems --- Artificial intelligence. Robotics. Simulation. Graphics --- Computer. Automation --- analyse (wiskunde) --- toegepaste wiskunde --- database management --- algoritmen --- KI (kunstmatige intelligentie) --- ingenieurswetenschappen --- robots --- numerieke analyse

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This book constitutes the refereed proceedings of the 9th International Conference on Electronic Commerce and Web Technologies, EC-Web 2008, held in Turin, Italy, in September, 2008 in conjunction with Dexa 2008. The 12 revised full papers presented together with 2 invited papers were carefully reviewed and selected from numerous submissions. The papers are organized in five topical sessions on security in e-commerce, social aspects of e-commerce, business process and EC infrastructures, recommender systems and e-negotiations, and Web marketing and user profiling.

Office management --- Distribution strategy --- Information systems --- Computer. Automation --- ICT (informatie- en communicatietechnieken) --- bedrijfseconomie --- informatica --- maatschappij --- bedrijfsadministratie --- informatiesystemen --- database management --- e-commerce --- informatica management