109 search results - page 22 / 22 » Optimization Using Tuple Subsumption |
SIGMOD
2009
ACM
14 years 5 months ago
2009
ACM
Research has investigated mappings among data sources under two perspectives. On one side, there are studies of practical tools for schema mapping generation; these focus on algor...
SIGMOD
2000
ACM
13 years 9 months ago
2000
ACM
We present WSQ/DSQ (pronounced “wisk-disk”), a new approach for combining the query facilities of traditional databases with existing search engines on the Web. WSQ, for Web-S...
POPL
1998
ACM
13 years 9 months ago
1998
ACM
abstractions, such as closures, tuples, and user-defined abstract data types. The type system ensures that well-typed programs cannot violate these abstractions. In addition, the ...
ISCI
2007
13 years 4 months ago
2007
Selectivity estimation is an important step of query optimization in a database management system, and multidimensional histogram techniques have proved promising for selectivity ...