98 search results - page 13 / 20 » A Formal Model for the Problem of View Selection for Aggrega... |
PODS
2006
ACM
14 years 7 months ago
2006
ACM
The query equivalence problem has been studied extensively for set-semantics and, more recently, for bag-set semantics. However, SQL queries often combine set and bag-set semantic...
ICDE
2011
IEEE
12 years 11 months ago
2011
IEEE
—Complex SQL queries are widely used today, but it is rather difficult to check if a complex query has been written correctly. Formal verification based on comparing a specifi...
SIGMOD
2010
ACM
14 years 15 days ago
2010
ACM
Modern maps provide a variety of information about roads and their surrounding landscape allowing navigation systems to go beyond simple shortest path computation. In this demo, w...
EDBTW
2004
Springer
14 years 1 months ago
2004
Springer
Abstract. The Web has been rapidly “deepened” with the prevalence of databases online. On this “deep Web,” numerous sources are structured, providing schema-rich data– Th...
PODS
2002
ACM
14 years 7 months ago
2002
ACM
Data Warehousing and OLAPapplications typically view data as having multiple logical dimensions e.g., product, location with natural hierarchies de ned on each dimension. OLAP que...