2514 search results - page 156 / 503 » On the Computation of Approximations of Database Queries |
142
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SIGMOD
2002
ACM
16 years 6 months ago
2002
ACM
Relational query optimizers have traditionally relied upon table cardinalities when estimating the cost of the query plans they consider. While this approach has been and continue...
178
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ICDE
2010
IEEE
16 years 3 months ago
2010
IEEE
— Many applications offer a form-based environment for na¨ıve users for accessing databases without being familiar with the database schema or a structured query language. User...
216
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CORR
2011
Springer
15 years 1 months ago
2011
Springer
We study in this paper provenance information for queries with aggregation. Provenance information was studied in the context of various query languages that do not allow for aggr...
183
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VLDB
1989
ACM
15 years 10 months ago
1989
ACM
This paper presents a parallel algorithm for recursive query processing and shows how it can be efficiently implemented in a local computer network. The algorithm relies on an int...
189
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ISCI
2000
15 years 6 months ago
2000
Data Quality has many dimensions one of which is accuracy. Accuracy is usually compromised by errors accidentally or intensionally introduced in a database system. These errors re...