-The wireless sensor network is to provide the users with access to the information of interest from data gathered by spatially distributed sensors. Generally the users require only certain aggregate functions of this distributed data. Computation of this aggregate data under the end-toend information flow paradigm by communicating all the relevant data to a central collector node is a highly i...

Aggregate queries in integration contexts often do not have one “true” answer; there can be multiple correct answers for the same aggregate query. This is due to the existence of duplicate or overlapping data points, possibly with di↵erent values, across the data sources. Depending on the choice of data source combinations that are used to answer the query, di↵erent answers can be generated. Th...