NDLI: Mapping-equivalence and oid-equivalence of single-function object-creating conjunctive queries

Content Provider	Springer Nature Link
Author	Bonifati, Angela Nutt, Werner Torlone, Riccardo Van den Bussche, Jan
Copyright Year	2016
Abstract	Conjunctive database queries have been extended with a mechanism for object creation to capture important applications such as data exchange, data integration, and ontology-based data access. Object creation generates new object identifiers in the result that do not belong to the set of constants in the source database. The new object identifiers can be also seen as Skolem terms. Hence, object-creating conjunctive queries can also be regarded as restricted second-order tuple-generating dependencies (SO-tgds), considered in the data exchange literature. In this paper, we focus on the class of single-function object-creating conjunctive queries, or sifo CQs for short. The single-function symbol can be used only once in the head of the query. We give a new characterization for oid-equivalence of sifo CQs that is simpler than the one given by Hull and Yoshikawa and places the problem in the complexity class NP. Our characterization is based on Cohen’s equivalence notions for conjunctive queries with multiplicities. We also solve the logical entailment problem for sifo CQs, showing that also this problem belongs to NP. Results by Pichler et al. have shown that logical equivalence for more general classes of SO-tgds is either undecidable or decidable with as yet unknown complexity upper bounds.
Starting Page	381
Ending Page	397
Page Count	17
File Format	PDF
ISSN	10668888
Journal	The VLDB Journal
Volume Number	25
Issue Number	3
e-ISSN	0949877X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conjunctive query Object creation Oid Equivalence Logical entailment SO-tgd Sifo CQ Nested tgd Schema mapping Database Management
Content Type	Text
Resource Type	Article
Subject	Information Systems Hardware and Architecture

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