About: SQLf

Property	Value
dbo:abstract	SQLf is a SQL extended with fuzzy set theory application for expressing flexible (fuzzy) queries to traditional (or ″Regular″) Relational Databases. Among the known extensions proposed to SQL, at the present time, this is the most complete, because it allows the use of diverse fuzzy elements in all the constructions of the language SQL. SQLf is the only known proposal of flexible query system allowing linguistic quantification over set of rows in queries, achieved through the extension of SQL nesting and partitioning structures with fuzzy quantifiers. It also allows the use of quantifiers to qualify the quantity of search criteria satisfied by single rows. Several mechanisms are proposed for query evaluation, the most important being the one based on the derivation principle. This consists in deriving classic queries that produce, given a threshold t, a t-cut of the result of the fuzzy query, so that the additional processing cost of using a fuzzy language is diminished. (en)
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dbo:wikiPageRevisionID	1119831009 (xsd:integer)
dbo:wikiPageWikiLink	dbr:Cartesian_product dbr:Relational_algebra dbc:Data_modeling_languages dbc:Declarative_programming_languages dbc:Query_languages dbr:SQL dbc:SQL dbc:Fuzzy_logic dbr:Fuzzy_logic dbr:Fuzzy_set dbc:Relational_database_management_systems dbc:Non-classical_logic dbr:Projection_(relational_algebra) dbr:Selection_(relational_algebra)
dbp:wikiPageUsesTemplate	dbt:Science_and_technology_studies dbt:Math dbt:Query_languages dbt:Reflist dbt:Databases dbt:Non-classical_logic dbt:SQL
dcterms:subject	dbc:Data_modeling_languages dbc:Declarative_programming_languages dbc:Query_languages dbc:SQL dbc:Fuzzy_logic dbc:Relational_database_management_systems dbc:Non-classical_logic
gold:hypernym	dbr:SQL
rdfs:comment	SQLf is a SQL extended with fuzzy set theory application for expressing flexible (fuzzy) queries to traditional (or ″Regular″) Relational Databases. Among the known extensions proposed to SQL, at the present time, this is the most complete, because it allows the use of diverse fuzzy elements in all the constructions of the language SQL. (en)
rdfs:label	SQLf (en)
owl:sameAs	freebase:SQLf wikidata:SQLf yago-res:SQLf https://global.dbpedia.org/id/2NoSc
prov:wasDerivedFrom	wikipedia-en:SQLf?oldid=1119831009&ns=0
foaf:isPrimaryTopicOf	wikipedia-en:SQLf
is dbo:wikiPageWikiLink of	dbr:Fuzzy_logic
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