|
Quel Mazzolin Di Fiori
Quel may refer to: * QUEL query languages, a relational database access language * Quel, La Rioja Quel is a village in the province and autonomous community of La Rioja, Spain. The municipality covers an area of and as of 2011 had a population of 2096 people. References Populated places in La Rioja (Spain) {{LaRiojaES-geo-stu ..., a municipality in La Rioja, Spain * ''Quél'', taxonomic author abbreviation for Lucien Quélet (1832–1899), French naturalist and mycologist {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
QUEL Query Languages
QUEL is a relational database query language, based on tuple relational calculus, with some similarities to SQL. It was created as a part of the Ingres DBMS effort at University of California, Berkeley, based on Codd's earlier suggested but not implemented ''Data Sub-Language ALPHA''. QUEL was used for a short time in most products based on the freely available Ingres source code, most notably in an implementation called POSTQUEL supported by POSTGRES. As Oracle and DB2 gained market share in the early 1980s, most companies then supporting QUEL moved to SQL instead. QUEL continues to be available as a part of the Ingres DBMS, although no QUEL-specific language enhancements have been added for many years. Usage QUEL statements are always defined by ''tuple variables'', which can be used to limit queries or return result sets. Consider this example, taken from one of the first original Ingres papers: range of E is EMPLOYEE retrieve into W (COMP = E.Salary / (E.Age - 18)) wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quel, La Rioja
Quel is a village in the province and autonomous community of La Rioja, Spain. The municipality covers an area of and as of 2011 had a population of 2096 people. References Populated places in La Rioja (Spain) {{LaRiojaES-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |