New Trends in Databases and Information Systems by Unknown

New Trends in Databases and Information Systems by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030546236
Publisher: Springer International Publishing


We can now characterize the data complexity of certain query answering. Recall that data complexity assumes the query and the data exchange setting to be fixed, and thus of fixed size, and only the source instance is given on the input. Consequently, the size of universal simulation solution is polynomially-bounded by the size of I. Since the data complexity of evaluating NREs is know to be PTIME [26], we get the following result.

Theorem 5

The data complexity of computing certain answers to forward nested regular expressions w.r.t. constructive relational to RDF data exchange setting is in PTIME.



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