The object-oriented data model TM is a language that is based on the formal theory of FM, a typed language with object-oriented features such as attributes and methods in the presence of subtyping. The general (typed) set constructs of FM allow one to deal with (database) constraints in TM. The paper describes the theory of FM, and discusses the role that set expressions may play in conceptual ...

ABS!l’RACT A theory of probabilistic databases is outlined. This theory is one component of an integrated approach to data-modelling that accomodates both probabilistic and relational data. In fact, many of the results presented here were developed in the context of a framework for structural modelling of systems. Much that is fundamental to relational database theory was also developed in this...

Rough set theory has become well-established as a mechanism for uncertainty management in a wide variety of applications including databases. This paper addresses the measurement of uncertainty in rough sets and rough relational databases by introducing a measurement based on information theory. This rough entropy is discussed as it applies to rough sets in general, and in particular to aspects...

The International Conference on Extending Database Technology (EDBT) and the International Conference on Database Theory (ICDT) are two prestigious forums for the exchange of the latest research results in the technological elements and theoretical foundations of data management and database systems. This year, five exciting workshops that focus on emerging topics in data management are co-loca...

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Teaching database engineers involves a variety of learning activities. A strong focus is on practical problems that go beyond the acquisition of knowledge. Skills and experience are equally important. We propose a virtual apprenticeship model for the knowledgeand skillsoriented Web-based education of database students. We adapt the classical cognitive apprenticeship theory to the Web context ut...

Our aim in this paper is to point out a surprising formal connection, between two topics which seem on face value to have nothing to do with each other: relational database theory, and the study of non-locality and contextuality in the foundations of quantum mechanics. We shall show that there is a remarkably direct correspondence between central results such as Bell’s theorem in the foundation...

This is a survey of collapse results obtained mainly by members of the Tver State University seminar on the theoretical foundations of computer science. Attention is focused on the relative isolation and pseudo-finite homogeneity properties and universes without the independence property. The Baldwin–Benedikt reducibility theorem is proved for these universes. The Dudakov boundedness theorem is...

Many important Management Support Systems require seamless access to and integration of multiple heterogeneous database systems. This paper studies heterogeneous database systems from the source perspective. It aims at addressing issues such as the following: (1) Where is the data from? (2) Which intermediate data sources were used to arrive at that data? Specifically, it presents a polygen mod...

In Knowledge and Data Engineering field, relational database is the best repository to store data in a real world. It has been using around the world more than eight decades. Normalization is the most important process for the analysis and design of relational databases. It aims at creating a set of relational tables with minimum data redundancy that preserve consistency and facilitate correct ...