Results 11 to 20 of about 337,613 (156)
Troubles with Nulls, Views from the Users [PDF]
, 2022 International audienceIncomplete data, in the form of null values, has been extensively studied since the inception of the relational model in the 1970s.
Guagliardo, Paolo +3 more
core +2 more sources
Nursing Open, Volume 10, Issue 2, Page 953-966, February 2023., 2023 Abstract In 2018, an NHS Trust (UK) implemented an innovative Nursing System Framework (NSF). The NSF formalized a two‐year strategy, which provided teams with clear aims and measurable objectives to deliver care. Failures of coordination of nursing services are well‐recognized threats to the quality, safety and sustainability of care provision. Aim To
Ann‐Marie Cannaby +6 more
wiley +1 more source
Vectorwise: Beyond Column Stores [PDF]
, 2012 textabstractThis paper tells the story of Vectorwise, a high-performance analytical database system, from multiple perspectives: its history from academic project to commercial product, the evolution of its technical architecture, customer reactions to ...
Boncz, P.A., Zukowski, M.
core +20 more sources
Strongly Possible Keys for SQL
Journal on Data Semantics, 2020 Missing data value is an extensive problem in both research and industrial developers. Two general approaches are there to deal with the problem of missing values in databases; they could be either ignored (removed) or imputed (filled in) with new values
Munqath Alattar, A. Sali
semanticscholar +1 more source
A dubiety-determining based model for database cumulated anomaly intrusion [PDF]
, 2007 The concept of Cumulated Anomaly (CA), which describes a new type of database anomalies, is addressed. A typical CA intrusion is that when a user who is authorized to modify data records under certain constraints deliberately hides his/her intentions ...
Lu, G, Lü, K, Yi, J
core +1 more source
Certified Programs and Proofs, 2019 In this article, we provide a Coq mechanised, executable, formal semantics for a realistic fragment of SQL consisting of "select [distinct] from where group by having" queries with null values, functions, aggregates, quantifiers and nested potentially ...
Véronique Benzaken, Évelyne Contejean
semanticscholar +1 more source
Implementing Performance Competitive Logical Recovery [PDF]
, 2010 New hardware platforms, e.g. cloud, multi-core, etc., have led to a reconsideration of database system architecture. Our Deuteronomy project separates transactional functionality from data management functionality, enabling a flexible response to ...
Lomet, David +2 more
core +2 more sources
Snapshot Semantics for Temporal Multiset Relations (Extended Version) [PDF]
, 2019 Snapshot semantics is widely used for evaluating queries over temporal data: temporal relations are seen as sequences of snapshot relations, and queries are evaluated at each snapshot.
Böhlen, Michael +4 more
core +1 more source
A Needle in a Haystack: Transient Porosity in a Closed Pore Square Lattice Coordination Network
Angewandte Chemie, Volume 137, Issue 14, April 1, 2025.Porosity “without pores”! We report a transiently porous coordination network that undergoes phase transformations between distinct closed pore phases in response to desolvation, humidity, or exposure to CO2 and C2H2 gases. Investigating its guest transport mechanism, we uncover a crystal engineering strategy with potential to enable the design of ...
Kyriaki Koupepidou +9 more
wiley +2 more sources
arXiv, 2021 The Nested Relational Calculus (NRC) has been an influential high-level query language, providing power and flexibility while still allowing translation to standard SQL queries. It has also been used as a basis for language-integrated query in programming languages such as F#, Scala, and Links.
arxiv