We have developed a system to process database queries over composed data providing web services. The queries are transformed into execution plans containing an operator that invok...
Abstract. Relational algebra has been a crucial foundation for relational database systems, and has played a large role in enabling their success. A corresponding XML algebra for X...
In this paper we deal with the problem of finding an optimal query execution plan in database systems. We improve the analysis of a polynomial-time approximation algorithm due to M...
Skyline query has been gaining much interest in database research communities in recent years. Most existing studies focus mainly on centralized systems, and resolving the problem...
Shiyuan Wang, Beng Chin Ooi, Anthony K. H. Tung, L...
We present a simple, yet powerful, approach for the specification and enforcement of authorizations regulating data release among data holders collaborating in a distributed comp...
Sabrina De Capitani di Vimercati, Sara Foresti, Su...