Results 21 to 30 of about 25,681 (265)

Supporting Schema References in Keyword Queries Over Relational Databases

IEEE Access, 2023
Relational Keyword Search (R-KwS) systems enable naive/informal users to explore and retrieve information from relational databases without knowing schema details or query languages.
Paulo Martins, Altigran Soares da Silva, Ariel Afonso, Joao Cavalcanti, Edleno de Moura   +4 more
doaj   +1 more source

Trends and Challenges of Databases

International Journal of Engineering and Management Sciences, 2018
The database management, using relational databases, is part of curriculum in the Hungarian high schools. The aim of this paper is to present how we can show for students the challenges facing data processing, data retrieval, beyond the relational ...
Mária Princz
doaj   +1 more source

RELATIONAL ASPECTS OF RELATIONAL DATABASE DEPENDENCIES [PDF]

Bulletin of informatics and cybernetics, 2000
Summary: This paper presents a relational treatment of inference rules for functional and multivalued dependencies in relational databases, to show the soundness and the completeness of the inference rules in Dedekind categories, which also cover the fuzzy case.
Okuma, Hitomi, Kawahara, Yasuo
openaire   +2 more sources

Performance of Graph and Relational Databases in Complex Queries

Applied Sciences, 2022
In developing NoSQL databases, a major motivation is to achieve better efficient query performance compared with relational databases. The graph database is a NoSQL paradigm where navigation is based on links instead of joining tables.
Petri Kotiranta, Marko Junkkari, Jyrki Nummenmaa   +2 more
doaj   +1 more source

Preferences in Temporal Relational Databases

IEEE Access
Despite the huge amount of work devoted to the treatment of time within the relational context, some relevant phenomena remain to be fully addressed. We focus on one of them, i.e., temporal indeterminacy with preferences.
Luca Anselma, Paolo Terenziani
doaj   +1 more source

Integration of Relational and Graph Databases Functionally

Foundations of Computing and Decision Sciences, 2019
In today’s multi-model database world there is an effort to integrate databases expressed in different data models. The aim of the article is to show possibilities of integration of relational and graph databases with the help of a functional data model ...
Pokorný Jaroslav
doaj   +1 more source

Field Report from Collaborative Research Center 1625: Heterogeneous Research Data Management Using Ontology Representations

Advanced Engineering Materials, EarlyView.
A unified research data management framework for heterogeneous materials data is presented. The system integrates multimodal datasets using ontologies and knowledge graphs, enabling interoperability and FAIR (findable, accessible, interoperable, reusable) data principles. By linking data across scales and workflows, it supports reproducible, Artifitial
Doaa Mohamed, Samuel García Vázquez, Behnam Mardani, Victor Dudarev, Alfred Ludwig, Maribel Acosta, Markus Stricker   +6 more
wiley   +1 more source

EQUIVALENCE THEOREM FOR GENERALIZED DEPENDENCIES IN RELATIONAL DATABASES

Tạp chí Khoa học Đại học Đà Lạt, 2013
In this paper, we present some new results related to the differential dependencies in relational databases. The main contributions are the following: (1) To introduce a new concept of generalized differential dependencies; (2) To claim and proof the ...
Nguyễn Xuân Huy, Trương Thị Thu Hà   +1 more
doaj   +1 more source

Fostering Innovation: Streamlining Magnetocaloric Materials Research by Digitalization

Advanced Engineering Materials, EarlyView.
Magnetocaloric cooling (MCE) is an environmentally friendly refrigeration method with great potential. Optimizing MCE materials involves the preparation and screening of large quantities of samples, which in turn generates a large amount of data. A digitalization approach is presented that uses ontologies, knowledge graphs, and digital workflows to ...
Simon Bekemeier, Moritz Blum, Luana Caron, Alisa Chirkova, Philipp Cimiano, Basil Ell, Inga Ennen, Michael Feige, Maik Gaerner, Thomas Hilbig, Andreas Hütten, Günter Reiss, Tapas Samanta, Sonja Schöning, Christian Schröder, Lennart Schwan, Chris Taake, Martin Wortmann   +17 more
wiley   +1 more source

Comparative analysis of the performance of selected database management system

Journal of Computer Sciences Institute
Currently, in the era of large amounts of generated data, a significant challenge is fast data processing. The aim of the article is to conduct a comparative analysis of the performance of relational and non-relational databases using MS SQL Server ...
Piotr Marcin Tracz, Małgorzata Plechawska-Wójcik   +1 more
doaj   +1 more source