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dc.contributor.authorGrahne, Gostaen_US
dc.contributor.authorRaiha, Kari-Joukoen_US
dc.date.accessioned2007-04-23T17:09:37Z
dc.date.available2007-04-23T17:09:37Z
dc.date.issued1985-05en_US
dc.identifier.citationhttp://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR85-682en_US
dc.identifier.urihttps://hdl.handle.net/1813/6522
dc.description.abstractAcyclic database schemes have attracted much interest because of the nice properties enjoyed by such schemes. Recently some new acyclicity conditions that are strictly stronger than the normal $\alpha$-acyclicity have been introduced by Fagin. Because of increased requirements, the database schemes in the new classes have some further useful properties that are not shared by $\alpha$-acyclic schemes. Therefore the new classes have practical relevance. A database designer may work in terms of attribute sets and data dependencies, and not only in terms of database schemes. Thus it is important to have a characterization for the acyclic schemes of various degree in terms of data dependencies. For $\alpha$-acyclic schemes such a characterization exists, but for the new classes the question has been open. In this paper we provide characterizations for $\beta$-, $\gamma$- and Berge-acyclic database schemes. The characterizations can be stated in a simple form: thus they should be useful for the database designer.en_US
dc.format.extent1994377 bytes
dc.format.extent989514 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/postscript
dc.language.isoen_USen_US
dc.publisherCornell Universityen_US
dc.subjectcomputer scienceen_US
dc.subjecttechnical reporten_US
dc.titleCharacterizations for Acyclic Database Schemesen_US
dc.typetechnical reporten_US


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