In the contemporary world, a large amount of heterogeneous data are accumulated, which have different nature and require specific approaches to their processing and storage. Even within one information system, it is often required to process data ...

In this Anecdotes department article, Don Chamberlin details his early work with Ray Boyce designing the relational language SQL. After meeting E.F. (Ted) Codd at a symposium at the IBM T.J. Watson Research Center in Yorktown Heights, New York, in 1972, ...

From semantic point of view, information is usually contained in small units, called facts that are usually smaller than sentences. Identification of these facts in a text is not a trivial task. We present a heuristic algorithm for extraction of facts ...

Functional decomposition of Boolean functions has a profound influence on all quality aspects of cost-effectively implementing modern digital systems and data-mining. The relational databases are multivalued tables, which include any truth tables of ...

We present a new framework for feature engineering of natural language processing that is based on a relational data model of text. It includes fast and flexible methods for implementing and extracting new features and thereby reduces the effort of ...

Witnessing the richness of data in document content and many ad-hoc efforts for finding such data, we propose a Data-oriented Content Query System(DoCQS), which is oriented towards fine granularity data of all types by searching directly into document ...

Information derived from relational databases is routinely used for decision making. However, little thought is usually given to the quality of the source data, its impact on the quality of the derived information, and how this in turn affects ...

While Bachman's role data model is often cited, it appears that its contribution, the introduction of role types and their conception as unions of entity types that occupy the places of relationship types, has mostly been ignored. This is unfortunate ...

While Bachman's role data model is often cited, it appears that its contribution, the introduction of role types and their conception as unions of entity types that occupy the places of relationship types, has mostly been ignored. This is unfortunate ...

One of the main new features in the Object-Relational Database Management Systems (ORDBMS) is possibility to define new data types. It increases the amount of design options as well as possibilities to make bad design decisions. For example, entity type ...

In retail information systems it is common practice to subsume the data of products into product groups, which offers organizational advantages for example when new branches are opened, because they are assigned product groups instead of single products. ...

In recent years various proposals have been offered for increasing the richness of the relational data model by addressing specific user requirements, particularly with regard to structural and behavioral expressiveness. Although there have been some ...

Data streaming has established itself as a viable communication abstraction in data-intensive parallel and distributed computations, occurring in applications such as scientific visualization, performance monitoring, and large-scale data transfer. A ...

Constraint databases exploit a fundamental duality: (i) a constraint (first-order formula) with free variables is interpreted as a set of database tuples that satisfy it; (ii) conversely, a database object can be viewed as a constraint. This enables us ...

Currently, most database management systems (DBMS) are based on the relational data model. Design methods that target relational models as the end product of logical design are generally based on the entity relationship model (ER) or semantic object ...

Research to extend models of data to handle the temporal dimension has been conducted mainly in the context of the relational data model. In the relational model, the primary object of database design, manipulation and retrieval is the relation, viewed ...

Summary form only given. The Object-Protocol Model (OPM) data management tools provide facilities for rapid development, documentation, and flexible exploration of scientific databases. The tools are based on OPM, an object-oriented data model which is ...

We present a probabilistic relational algebra (PRA) which is a generalization of standard relational algebra. In PRA, tuples are assigned probabilistic weights giving the probability that a tuple belongs to a relation. Based on intensional semantics, ...