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Three types of queries are considered: (i) those about attribute values (in an algebraic or SQL-like framework), (ii) those about the properties satisfied by a given set of worlds (i.e., a set of instances of an imprecise database), and (iii) those about the representation of uncertain data. For the first two types, it is emphasized that a trade-off has to be found between expressivity (of the model) and tractability (of the queries in the context of a given model). <\/jats:p>","DOI":"10.1142\/s0218488510006702","type":"journal-article","created":{"date-parts":[[2010,9,13]],"date-time":"2010-09-13T09:50:41Z","timestamp":1284371441000},"page":"565-603","source":"Crossref","is-referenced-by-count":27,"title":["MODELING AND QUERYING UNCERTAIN RELATIONAL DATABASES: A SURVEY OF APPROACHES BASED ON THE POSSIBLE WORLDS SEMANTICS"],"prefix":"10.1142","volume":"18","author":[{"given":"PATRICK","family":"BOSC","sequence":"first","affiliation":[{"name":"Institut de Recherche en Informatique et Syst\u00e8mes Al\u00e9atoires, Ecole Nationale Sup\u00e9rieure des Sciences Appliqu\u00e9es et de Technologie (IRISA-ENSSAT), University of Rennes 1, BP 80518, 22300 Lannion, France"}]},{"given":"OLIVIER","family":"PIVERT","sequence":"additional","affiliation":[{"name":"Institut de Recherche en Informatique et Syst\u00e8mes Al\u00e9atoires, Ecole Nationale Sup\u00e9rieure des Sciences Appliqu\u00e9es et de Technologie (IRISA-ENSSAT), University of Rennes 1, BP 80518, 22300 Lannion, France"}]}],"member":"219","published-online":{"date-parts":[[2011,11,21]]},"reference":[{"key":"rf1","volume-title":"Foundations of Databases","author":"Abiteboul S.","year":"1995"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1016\/0304-3975(51)90007-2"},{"key":"rf4","doi-asserted-by":"publisher","DOI":"10.1109\/TKDE.2008.190"},{"key":"rf9","doi-asserted-by":"publisher","DOI":"10.1109\/69.166990"},{"key":"rf10","first-page":"12","volume":"16","author":"Barga R. 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