Logical foundations and complexity of 4QL, a query language with unrestricted negation.

Jan Maluszynski Andrzej Szalas

Published in: J. Appl. Non Class. Logics (2011)

Keyphrases

query language
logical foundations
data model
database
query evaluation
expressive power
object oriented
relational algebra
active databases
complex objects
fine grained
conjunctive queries
web services
recursive queries