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Datalog Expressiveness of Chain Queries: Grammar Tools and Characterizations.

Guozhu Dong: Datalog Expressiveness of Chain Queries: Grammar Tools and Characterizations. PODS 1992: 81-90
@inproceedings{DBLP:conf/pods/Dong92,
  author    = {Guozhu Dong},
  title     = {Datalog Expressiveness of Chain Queries: Grammar Tools and Characterizations},
  booktitle = {Proceedings of the Eleventh ACM SIGACT-SIGMOD-SIGART Symposium
               on Principles of Database Systems, June 2-4, 1992, San Diego,
               California},
  publisher = {ACM Press},
  year      = {1992},
  isbn      = {0-89791-519-4},
  pages     = {81-90},
  ee        = {http://doi.acm.org/10.1145/137097.137113, db/conf/pods/Dong92.html},
  crossref  = {DBLP:conf/pods/92},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX

Abstract

A chain query seeks, for each input database (viewed as a directed graph), all pairs of start and end nodes of paths whose labels spell words in an associated (possibly non context-free) language over some binary predicates. We study the expressive power of Datalog for chain queries. Extending context-free productions with labels, we introduce a new tool called "indexed positive programmed grammar" (IPPG). Three variations of IPPG are introduced to characterize chain queries computable (i) by linear Datalog, (ii) by "semi-linear Datalog", and (iii) by general Datalog, respectively, under a natural "addressable" condition.

Copyright © 1992 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.


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Printed Edition

Proceedings of the Eleventh ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 2-4, 1992, San Diego, California. ACM Press 1992, ISBN 0-89791-519-4
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References

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Referenced by

  1. Serge Abiteboul, Richard Hull, Victor Vianu: Foundations of Databases. Addison-Wesley 1995, ISBN 0-201-53771-0
    Contents
  2. Guozhu Dong, Jianwen Su: First-Order Incremental Evaluation of Datalog Queries. DBPL 1993: 295-308
  3. Sergio Greco: Optimization of Chain Queries. DASFAA 1993: 261-268
  4. Guozhu Dong, Rodney W. Topor: Incremental Evaluation of Datalog Queries. ICDT 1992: 282-296
BibTeX
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