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Statements

Subject Item
dbr:SQLf
rdfs:label
SQLf
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.
dcterms:subject
dbc:Query_languages dbc:Relational_database_management_systems dbc:Declarative_programming_languages dbc:Fuzzy_logic dbc:Non-classical_logic dbc:Data_modeling_languages dbc:SQL
dbo:wikiPageID
46948278
dbo:wikiPageRevisionID
1119831009
dbo:wikiPageWikiLink
dbr:Fuzzy_set dbr:Fuzzy_logic dbr:Relational_algebra dbr:SQL dbc:Relational_database_management_systems dbc:Declarative_programming_languages dbc:Fuzzy_logic dbc:SQL dbr:Cartesian_product dbc:Query_languages dbc:Data_modeling_languages dbr:Selection_(relational_algebra) dbc:Non-classical_logic dbr:Projection_(relational_algebra)
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dbt:Non-classical_logic dbt:Query_languages dbt:Databases dbt:SQL dbt:Reflist dbt:Science_and_technology_studies dbt:Math
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.
gold:hypernym
dbr:SQL
prov:wasDerivedFrom
wikipedia-en:SQLf?oldid=1119831009&ns=0
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4964
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wikipedia-en:SQLf
Subject Item
dbr:Fuzzy_logic
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dbr:SQLf
Subject Item
wikipedia-en:SQLf
foaf:primaryTopic
dbr:SQLf