This paper surveys methods for representing and reasoning with imperfect information. It
opens with an attempt to classify the different types of imperfection that may pervade data …

The effective integration of data and knowledge from many disparate sources will be crucial
to future drug discovery. Data integration is a key element of conducting scientific …

This database theory book provides a focused presentation of the core material on relational
databases, and presents a number of advanced topics in a unified framework. Some of the …

SPARQL is the standard language for querying RDF data. In this article, we address
systematically the formal study of the database aspects of SPARQL, concentrating in its …

This paper concerns the semantics of Codd's relational model of data. Formulated are
precise conditions that should be satisfied ma semantically meaningful extension of the …

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 …

Information is a valuable resource to an organization. Computer software provides an
efficient means of processing information, and database systems are becoming an …

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We represent a set of possible worlds using an incomplete information database. The
representation techniques that we study range from the very simple Codd-table (a relation …

This book presents an overview of the most fundamental aspects of the theory that underlies
the Relational Database Model. As such it is self-contained though experience with formal …