1497 search results - page 163 / 300 » Constraint Databases: A Survey |
125
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SDB
1995
15 years 1 months ago
1995
Most of work on partial information in databases asks which operations of standard languages, like relational algebra, can still be performed correctly in the presence of nulls. In...
PODS
2006
ACM
15 years 10 months ago
2006
ACM
Data exchange deals with inserting data from one database into another database having a different schema. We study and solve a central computational problem of data exchange, nam...
VLDB
1994
ACM
15 years 2 months ago
1994
ACM
This paper introduces a formalism to describe the needs and preferences of database users. Because of the precise formulation of these concepts, we have found an automatic and ver...
123
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BMCBI
2011
14 years 1 months ago
2011
Background: The secondary structure of RNA molecules is intimately related to their function and often more conserved than the sequence. Hence, the important task of searching dat...
HICSS
2009
IEEE
15 years 5 months ago
2009
IEEE
Second Life is an online virtual world that is gaining popularity in academic institutions as an alternative means for collaborative and distance education. However, the number of...