995 search results - page 5 / 199 » Optimization of Complex Nested Queries in Relational Databas... |
SIGMOD
2005
ACM
14 years 5 months ago
2005
ACM
Nested Intervals generalize Nested Sets. They are immune to hierarchy reorganization problem. They allow answering ancestor path hierarchical queries algorithmically - without acc...
WWW
2003
ACM
13 years 11 months ago
2003
ACM
In this poster, we introduce the mechanism of handling the ordering structure of XML data by using the Nested Relational Sequence Database System (NRSD), which is built upon the N...
DMDW
2000
13 years 7 months ago
2000
View materialization is a central issue in logical design of data warehouses since it is one of the most powerful techniques to improve the response to the workload. Most approach...
SIGMOD
2006
ACM
14 years 5 months ago
2006
ACM
We present and analyze an algorithm for equivalent rewriting of XQuery queries using XQuery views, which is complete for a large class of XQueries featuring nested FLWR blocks, XM...
PODS
2008
ACM
14 years 5 months ago
2008
ACM
We consider the navigational core of XPath, extended with two operators: the Kleene star for taking the transitive closure of path expressions, and a subtree relativisation operat...