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SQL query modification algorithms

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2 Author(s)
Chou, D. ; California Univ., Berkeley, CA, USA ; Segev, A.

Algebra rules and a query modification algorithm that enable modifications of SQL queries considered hitherto as nonmodifiable are introduced. Cases where aggregates are involved are emphasized. Also introduced is a technique to translate a view with DISTINCT keyword into an equivalent grouped view without DISTINCT; as a result some queries that were not modifiable on the DISTINCT view become modifiable. A set of commutative and merging rules at the relational algebra level that are used to derive the query modification algorithm systematically is developed

Published in:
Information Technology, 1990. 'Next Decade in Information Technology', Proceedings of the 5th Jerusalem Conference on (Cat. No.90TH0326-9)

Date of Conference: 22-25 Oct 1990

Page(s):
551 - 559
Meeting Date :
22 Oct 1990-25 Oct 1990
Print ISBN:
0-8186-2078-1
INSPEC Accession Number:
3966561
Conference Location :
Jerusalem
Digital Object Identifier :
10.1109/JCIT.1990.128327
Product Type:
Conference Publications

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