716 search results - page 132 / 144 » Optimizing Queries in Extended Relational Databases |
140
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VLDB
2008
ACM
15 years 11 months ago
2008
ACM
Histograms are used to summarize the contents of relations into a number of buckets for the estimation of query result sizes. Several techniques (e.g., MaxDiff and V-Optimal) have ...
CIKM
2005
Springer
15 years 4 months ago
2005
Springer
Accurately and efficiently estimating the number of distinct values for some attribute(s) or sets of attributes in a data set is of critical importance to many database operation...
103
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KES
2006
Springer
14 years 11 months ago
2006
Springer
Named entities (e.g., "Kofi Annan", "Coca-Cola", "Second World War") are ubiquitous in web pages and other types of document and often provide a simpl...
171
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ICDE
2008
IEEE
16 years 16 days ago
2008
IEEE
Many data integration solutions in the market today include tools for schema mapping, to help users visually relate elements of different schemas. Schema elements are connected wit...
84
Voted
WWW
2001
ACM
15 years 11 months ago
2001
ACM
Integrity constraints are an essential part of a modern schema definition language. They are useful for semantic specification, update consistency control, query optimization, inf...