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Uncertain data are inherent in some important applications, such as environmental surveillance, market analysis, and quantitative economics research. Due to the importance of those applications and the rapidly increasing amount of uncertain data collected and accumulated, analyzing large collections of uncertain data has become an important task and has attracted more and more interest from the database community. Recently, uncertain data management has become an emerging hot area in databasedoi:10.1145/1376616.1376774 dblp:conf/sigmod/PeiHTL08 fatcat:ijx3l2v5kfdnrcdnzmqukgm26q