@inproceedings{2b8c3d84585b4664a60b0ccdbebca2f2,
title = "Role-based query processing in multidatabase systems",
abstract = "We address the problem of data integration and query processing in multidatabase systems in the presence of conflicting values for the attributes that correspond to different instances of the same re;dworld object appearing in multiple roles. We present a new method for schema and data integration in multidatabase systems that presents the answer to the query as a set of sets representing the distinct intersections between the relations representing the various roles of interest. We present extensions to MSQL that allow us to express role-sets and quantitiers applied to them. We further develop a strategy for query processing based on our role-based model. Our method allows for local selection for all queries with/without aggregation and thus reduces the amount of data transmitted. In addition, it makes efficient use of merge-sort techniques to generate the role-sets and compute joins at the global query site.",
author = "Peter Scheuermann and Chong, {Eugene Inseok}",
note = "Publisher Copyright: {\textcopyright} 1994, Springer Verlag. All rights reserved.; 4th International Conference on Extending Database Technology, EDBT 1994 ; Conference date: 28-03-1994 Through 31-03-1994",
year = "1994",
doi = "10.1007/3-540-57818-8_44",
language = "English (US)",
isbn = "9783540578185",
series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",
publisher = "Springer Verlag",
pages = "95--108",
editor = "Matthias Jarke and Janis Bubenko and Keith Jeffery",
booktitle = "Advances in Database Technology - EDBT 1994 - 4th International Conference on Extending Database Technology, Proceedings",
}