2063 search results - page 82 / 413 » Containment of Aggregate Queries |
123
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DAWAK
2003
Springer
15 years 9 months ago
2003
Springer
Abstract. Many SQL queries with aggregated subqueries exhibit redundancy (overlap in FROM and WHERE clauses). We propose a method, called the for-loop, to optimize such queries by ...
118
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DBPL
1999
Springer
15 years 8 months ago
1999
Springer
We consider IES(SQL), the incremental evaluation system over an SQL-like language with grouping, arithmetics, and aggregation. We show that every second order query is in IES(SQL) ...
141
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ICDT
2007
ACM
15 years 10 months ago
2007
ACM
In this paper, we introduce preferential regular path queries. These are regular path queries whose symbols are annotated with preference weights for “scaling” up or down the i...
130
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ICEIS
2003
IEEE
15 years 9 months ago
2003
IEEE
: We propose in this article an object-oriented approach to rewriting queries using views. Our approach aims to mitigate certain limitations of existing query rewriting approaches....
124
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EMNLP
2007
15 years 5 months ago
2007
Query segmentation is the process of taking a user’s search-engine query and dividing the tokens into individual phrases or semantic units. Identification of these query segmen...