PTIME Queries Revisited
International Conference on Database Theory, pp. 274-288, 2005.
richer languageptime propertyfixed setdatabase query languagecentral open problemMore(5+)
The existence of a language expressing precisely the PTIME queries on arbitrary structures remains the central open problem in the theory of database query languages. As it turns out, two variants of this question have been formulated. Surprisingly, despite the importance of the problem, the relationship between these variants has not bee...More
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