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Algebraic Support for Complex Objects with Arrays, Identity, and Inheritance.

Scott L. Vandenberg, David J. DeWitt: Algebraic Support for Complex Objects with Arrays, Identity, and Inheritance. SIGMOD Conference 1991: 158-167
@inproceedings{DBLP:conf/sigmod/VandenbergD91,
  author    = {Scott L. Vandenberg and
               David J. DeWitt},
  editor    = {James Clifford and
               Roger King},
  title     = {Algebraic Support for Complex Objects with Arrays, Identity,
               and Inheritance},
  booktitle = {Proceedings of the 1991 ACM SIGMOD International Conference on
               Management of Data, Denver, Colorado, May 29-31, 1991},
  publisher = {ACM Press},
  year      = {1991},
  pages     = {158-167},
  ee        = {http://doi.acm.org/10.1145/115790.115811, db/conf/sigmod/VandenbergD91.html},
  crossref  = {DBLP:conf/sigmod/91},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX

Abstract

Algebraic query processing and optimization for relational databases is a proven and reasonably well-understood technology. Recently the algebraic approach has been extended to more advanced data models (nested relations, complex objects, object-oriented systems). Here we continue this evolution by presenting novel algebraic operators and transformations supporting grouping, arrays, references, and multisets. We also propose a new approach to processing and optimizing overridden methods in the presence of multiple inheritance. The utility of both the algebraic operators and the transformation rules is demonstrated with examples. Object identity is incorporated into the algebraic domains, giving an original, intuitive set-theoretic semantics for the domains of object identifiers in the presence of multiple inheritance. We prove that the algebra is equripollent to the QUEL-like user-level query language and discuss some other expressiveness issues.

Copyright © 1991 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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James Clifford, Roger King (Eds.): Proceedings of the 1991 ACM SIGMOD International Conference on Management of Data, Denver, Colorado, May 29-31, 1991. ACM Press 1991 BibTeX , SIGMOD Record 20(2), June 1991
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Referenced by

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  28. Bharathi Subramanian, Stanley B. Zdonik, Theodore W. Leung, Scott L. Vandenberg: Ordered Types in the AQUA Data Model. DBPL 1993: 115-135
  29. Theodore W. Leung, Gail Mitchell, Bharathi Subramanian, Bennet Vance, Scott L. Vandenberg, Stanley B. Zdonik: The AQUA Data Model and Algebra. DBPL 1993: 157-175
  30. Sophie Cluet, Guido Moerkotte: Nested Queries in Object Bases. DBPL 1993: 226-242
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  34. Catriel Beeri: New Data Models and Languages - the Challenge. PODS 1992: 1-15
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  36. Joseph Albert: Algebraic Properties of Bag Data Types. VLDB 1991: 211-219
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