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http://hdl.handle.net/1942/5470| Title: | Semi-determinism | Authors: | VAN DEN BUSSCHE, Jan van Gucht, Dirk |
Issue Date: | 1992 | Publisher: | s.l. ACM Press 1992 | Source: | Proceedings of the 11th ACM Symposium on Principles of Database Systems. p. 191-201 | Abstract: | We investigate under which conditions a non-deterministic query is semi-deterministic, meaning that two different results of the query to a database are isomorphic. We also consider uniform semi-determinism, meaning that all intermediate results of the computation are isomorphic. Semi-determinism is a concept bridging the new trends of non-determinism and object generation in database query languages. Our results concern decidability, both at compile time and at run time; expressibility of the infamous counting queries; and completeness, which is related to the issue of copy elimination raised by Abiteboul and Kannelakis. | Document URI: | http://hdl.handle.net/1942/5470 | Link to publication/dataset: | http://doi.acm.org/10.1145/137097.137866 | Type: | Journal Contribution |
| Appears in Collections: | Research publications |
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