6650 search results - page 566 / 1330 » Mutating database queries |
191
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XSYM
2007
Springer
16 years 1 months ago
2007
Springer
To globally optimize execution plans for XQuery expressions, a plan generator must generate and compare plan alternatives. In proven compiler architectures, the unit of plan genera...
160
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ITICSE
2004
ACM
16 years 13 days ago
2004
ACM
This paper examines the effect of grading approaches for SQL query formulation on students’ learning strategies. The way that students are graded in a subject has a significant ...
193
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XSYM
2004
Springer
16 years 10 days ago
2004
Springer
In this paper, we describe an approach to boosting the performance of an XQuery engine by identifying and exploiting opportunities to share processing both within and across XML qu...
199
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ADC
2003
Springer
16 years 7 days ago
2003
Springer
Selectivity estimation of queries not only provides useful information to the query processing optimization but also may give users a preview of processing results. In this paper,...
183
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SSD
1999
Springer
15 years 11 months ago
1999
Springer
We provide an evaluation of query execution plans (QEP) in the case of queries with one or two spatial joins. The QEPs assume R -tree indexed relations and use a common set of spat...