3 search results - page 1 / 1 » The semijoin algebra and the guarded fragment |
CORR
2004
Springer
13 years 4 months ago
2004
Springer
In the 1970s Codd introduced the relational algebra, with operators selection, projection, union, difference and product, and showed that it is equivalent to first-order logic. In ...
ICDT
2007
ACM
13 years 11 months ago
2007
ACM
We introduce a new abstract model of database query processing, finite cursor machines, that incorporates certain data streaming aspects. The model describes quite faithfully what...
ICDT
2009
ACM
14 years 5 months ago
2009
ACM
The need to manage diverse information sources has triggered the rise of very loosely structured data models, known as "dataspace models." Such information management sy...