Titlebook: Database Programming Languages; 8th International Wo Giorgio Ghelli,G?sta Grahne Conference proceedings 2002 Springer-Verlag Berlin Heidelb

convert

Inexorable

Directed

負(fù)擔(dān)

Adulate

Linear Approximation of Semi-algebraic Spatial Databases Using Transitive Closure Logic, in Arbitrarebraic spatial databases in arbitrary dimensions, our earlier results being true for only two dimensions..Consequently, we can prove that first-order logic with a transitive closure operator extended with stop conditions, can express all Boolean topological queries on semi-algebraic spatial databases of arbitrary dimension.

Consensus

萬(wàn)靈丹

尊嚴(yán)

天氣

Alienated

Molecular Interrelationships and Functions,ne nature of time..We investigate different genericity classes relative to the constraint database model for spatio-temporal databases and we identify sound and complete languages for the first-order, respectively the computable, queries in these genericity classes.