CoBase: a scalable and extensible cooperative information system
Journal of Intelligent Information Systems - Special issue on intelligent integration of information
On saying “Enough already!” in SQL
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Fuzzy queries in multimedia database systems
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Authoritative sources in a hyperlinked environment
Journal of the ACM (JACM)
Optimal aggregation algorithms for middleware
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
PREFER: a system for the efficient execution of multi-parametric ranked queries
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Top-k selection queries over relational databases: Mapping strategies and performance evaluation
ACM Transactions on Database Systems (TODS)
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Supporting Incremental Join Queries on Ranked Inputs
Proceedings of the 27th International Conference on Very Large Data Bases
Sesame: A Generic Architecture for Storing and Querying RDF and RDF Schema
ISWC '02 Proceedings of the First International Semantic Web Conference on The Semantic Web
A Sampling-Based Estimator for Top-k Query
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
A relaxed approach to RDF querying
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
Combining approximation and relaxation in semantic web path queries
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Query relaxation for star queries on RDF
WISE'10 Proceedings of the 11th international conference on Web information systems engineering
Query relaxation for entity-relationship search
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
Approximating query answering on RDF databases
World Wide Web
Towards fuzzy query-relaxation for RDF
ESWC'12 Proceedings of the 9th international conference on The Semantic Web: research and applications
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Database users may be frustrated by no answers returned when they pose a query on the database. In this paper, we study the problem of relaxing queries on RDF databases in order to acquire approximate answers. We address two problems for efficient query relaxation. First, to ensure the quality of answers, we compute the similarities of relaxed queries with regard to the original query and use them to score the potential relevant answers. We also propose the algorithm to get most relevant answers as soon as possible. Second, to optimise query relaxation process, we characterize a type of unnecessary relaxed queries which do not contribute to the final results and propose the method to prune them from the query relaxation graph. At last, we implement and experimentally evaluate our approach.