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http://hdl.handle.net/1942/7909
Title: | Relational completeness of query languages for annotated databases | Authors: | GEERTS, Floris VAN DEN BUSSCHE, Jan |
Issue Date: | 2007 | Publisher: | SPRINGER-VERLAG BERLIN | Source: | 27Proceedings of the 11th International Workshop on Database Programming. p. 127-137 | Series/Report: | Lecture Notes in Computer Science | Series/Report no.: | 4797 | Abstract: | Annotated relational databases can be queried either by simply making the annotations explicitly available along the ordinary data, or by adapting the standard query operators so that they have an implicit effect also on the annotations. We compare the expressive power of these two approaches. As a formal model for the implicit approach we propose the color algebra, an adaptation of the relational algebra to deal with the annotations. We show that the color algebra is relationally complete: it is equivalent to the relational algebra on the explicit annotations. Our result extends a similar completeness result established for the query algebra of the MONDRIAN annotation system, from unions of conjunctive queries to the full relational algebra. | Notes: | Reprint Address: Geerts, F (reprint author), Univ Edinburgh, Edinburgh EH8 9YL, Midlothian, Scotland. Addresses: 1. Univ Edinburgh, Edinburgh EH8 9YL, Midlothian, Scotland 2. Transnct Univ Limburg, Hasselt Univ, Hasselt, Belgium | Keywords: | Annotated relational databases; Expressive power; Query languages | Document URI: | http://hdl.handle.net/1942/7909 | ISBN: | 978-3-540-75986-7 | DOI: | 10.1007/978-3-540-75987-4_9 | ISI #: | 000250804700009 | Rights: | Springer-Verlag Berlin Heidelberg 2007 | Category: | C1 | Type: | Proceedings Paper |
Appears in Collections: | Research publications |
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