Results 21 to 30 of about 663,961 (238)
Relational Playground: Teaching the Duality of Relational Algebra and SQL [PDF]
, 2023 Students in introductory data management courses are often taught how to write queries in SQL. This is a useful and practical skill, but it gives limited insight into how queries are processed by relational database engines. In contrast, relational algebra is a commonly used internal representation of queries by database engines, but can be challenging
arxiv +1 more source
BioData Mining, 2022 Background Knowledge graphs support biomedical research efforts by providing contextual information for biomedical entities, constructing networks, and supporting the interpretation of high-throughput analyses.
David N. Nicholson +2 more
doaj +1 more source
Prognosing Human Activity Using Actions Forecast and Structured Database
IEEE Access, 2020 The goal of this work is to forecast human activities that may require robot assistance. Each activity consists of consecutive actions. Each action is bounded by initial and final state and is created by the motion trajectory.
Vibekananda Dutta, Teresa Zielinska
doaj +1 more source
Data, 2022 This paper presents a database that includes information on national recipes and their ingredients for 171 countries, measures for food taste similarities between all 171 countries as well as bilateral migration and agro-food trade data for 5 years.
Anne C. Wunderlich, Andreas Kohler
doaj +1 more source
Comparison of NoSQL Database and Traditional Database-An emphatic analysis
JOIV: International Journal on Informatics Visualization, 2018 A Huge amount of data is manipulated by using the web application, Facebook, Twitter, social sites etc. Most of the data are unstructured data. It is not desirable for storing, performing and analyzing data in the relational database for huge data.
M. Sandeep Kumar, Prabhu .J
doaj +1 more source
ESTIMATION OF GEOGRAPHICAL DATABASES CAPTURE SCALE BASED ON INTER-VERTICES DISTANCES EXPLORATION [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015 This article presents a method to estimate the capture scale of a geographical database based on the characterization of its level of detail. This contribution fits in a larger research, dealing with the development of a general model to estimate the ...
J.-F. Girres
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End-to-End Database Software Security
Software, 2023 End-to-end security is essential for relational database software. Most database management software provide data protection at the server side and in transit, but data are no longer protected once they arrive at the client software.
Denis Ulybyshev +3 more
doaj +1 more source
Nest and Unnest Operators in Nested Relations
Data Science Journal, 2008 By distinguishing nested attributes as Decomposable and Non-Decomposable, it is proved that for all nested relations, unnesting and then renesting on the same attribute yields the original relation subject only to the elimination of duplicate data ...
Georgia Garani
doaj +1 more source
Measuring accessibility: A Big Data perspective on Uber service waiting times [PDF]
RAE: Revista de Administração de Empresas, 2019 This study aims to relate information about the waiting times of ride-sourcing services, with specific reference to Uber, using socioeconomic variables from São Paulo, Brazil.
André Insardi, Rodolfo Oliveira Lorenzo
doaj +2 more sources
Automatic Conversion of Relational Databases into Ontologies: A Comparative Analysis of Protégé Plug-ins Performances [PDF]
International Journal of Web and Semantic Technology (IJWesT),
2016, 2016 Constructing ontologies from relational databases is an active research topic in the Semantic Web domain. While conceptual mapping rules/principles of relational databases and ontology structures are being proposed, several software modules or plug-ins are being developed to enable the automatic conversion of relational databases into ontologies ...
arxiv +1 more source