Results 21 to 30 of about 983,529 (297)
Gaining Insights into Conceptual Models: A Graph-Theoretic Querying Approach
Applied Sciences, 2021 Modern complex systems include products and services that comprise many interconnected pieces of integrated hardware and software, which are expected to serve humans interacting with them. As technology advances, expectations of a smooth, flawless system
Danny Medvedev, Uri Shani, Dov Dori
doaj +1 more source
The XML Query Language Xcerpt: Design Principles, Examples, and Semantics [PDF]
, 2002 Most query and transformation languages developed since the mid 90es for XML and semistructured data—e.g. XQuery [1], the precursors of XQuery [2], and XSLT [3]—build upon a path-oriented node selection: A node in a data item is specified in terms of a ...
Schaffert, Sebastian +3 more
core +1 more source
Path querying on acyclic graphs using Boolean grammars
Труды Института системного программирования РАН, 2019 Graph data models are widely used in different areas of computer science such as bioinformatics, graph databases, social networks and static code analysis. One of the problems in graph data analysis is querying for specific paths.
Ekaterina Nikolaevna Shemetova +1 more
doaj +1 more source
Constrained Query Answering [PDF]
, 1994 Traditional answering methods evaluate queries only against positive and definite knowledge expressed by means of facts and deduction rules. They do not make use of negative, disjunctive or existential information.
Bry, François, Demolombe, R.
core +1 more source
Hindi Language Interface to Database [PDF]
ITM Web of Conferences, 2020 In our everyday lives we require information to accomplish daily tasks. Database is one of the most important sources of information. Database systems have been widely used in data storage and retrieval. However, to extract information from databases, we
Dubey Rachana +3 more
doaj +1 more source
Implementation of Web Query Languages Reconsidered [PDF]
, 2008 Visions of the next generation Web such as the "Semantic Web" or the "Web 2.0" have triggered the emergence of a multitude of data formats. These formats have different characteristics as far as the shape of data is concerned (for example tree- vs. graph-
Furche, Tim
core +1 more source
A Review of Accessing Big Data with Significant Ontologies
Knowledge Engineering and Data Science, 2020 Ontology Based Data Access (OBDA) is a recently proposed approach which is able to provide a conceptual view on relational data sources. It addresses the problem of the direct access to big data through providing end-users with an ontology that goes ...
Jumah Y.J Sleeman +1 more
doaj +1 more source
LotusSQL: SQL Engine for High-Performance Big Data Systems
Big Data Mining and Analytics, 2021 In recent years, Apache Spark has become the de facto standard for big data processing. SparkSQL is a module offering support for relational analysis on Spark with Structured Query Language (SQL).
Xiaohan Li +4 more
doaj +1 more source
Modular Web Queries — From Rules to Stores [PDF]
, 2007 Even with all the progress in Semantic technology, accessing Web data remains a challenging issue with new Web query languages and approaches appearing regularly.
Henriksson, Jakob +12 more
core +1 more source
References and arrow notation instead of join operation in query languages [PDF]
Computer Science Journal of Moldova, 2012 We study properties of the join operation in query languages and describe some of its major drawbacks. We provide strong arguments against using joins as a main construct for retrieving related data elements in general purpose query languages and argue ...
Alexandr Savinov
doaj