On the Containment and Equivalence of Database Queries with Linear Constraints.
Oscar H. Ibarra, Jianwen Su:
On the Containment and Equivalence of Database Queries with Linear Constraints.
PODS 1997: 32-43@inproceedings{DBLP:conf/pods/IbarraS97,
author = {Oscar H. Ibarra and
Jianwen Su},
title = {On the Containment and Equivalence of Database Queries with Linear
Constraints},
booktitle = {Proceedings of the Sixteenth ACM SIGACT-SIGMOD-SIGART Symposium
on Principles of Database Systems, May 12-14, 1997, Tucson, Arizona},
publisher = {ACM Press},
year = {1997},
isbn = {0-89791-910-6},
pages = {32-43},
ee = {http://doi.acm.org/10.1145/263661.263666, db/conf/pods/IbarraS97.html},
crossref = {DBLP:conf/pods/97},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX
Abstract
We develop a new technique based on counter machines to
study the containment and equivalence of queries with
linear constraints over integers Z, natural numbers N, rational
numbers Q, and real numbers R. We show that the
problems are decidable in double exponential time with
an exponential time lower bound for conjunctive queries
with linear contraints over Z and N, decidable in double
exponential time for constant-free conjunctive queries with
linear constraints over Q and R. For the general class of
conjunctive queries with linear constraints over Q and R, the
problems are decidable in double exponential space using
reductions to the first-order theory of reals with addition.
We also use the counter machine technique to show that
for "connected" first-order queries with linear constraints over Z and
N, the containment and equivalence problems are decidable over
"bounded-degree databases".
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BibTeX
Printed Edition
Proceedings of the Sixteenth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 12-14, 1997, Tucson, Arizona.
ACM Press 1997, ISBN 0-89791-910-6
Contents BibTeX
[Index Terms]
[Full Text in PDF Format, 1659 KB]
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ADBIS 1998: 46-57
BibTeX
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