Encyclopedia of Database Systems 2018
DOI: 10.1007/978-1-4614-8265-9_80689
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Query Processing over Uncertain Data

Abstract: An uncertain or probabilistic database is defined as a probability distribution over a set of deterministic database instances called possible worlds.In the classical deterministic setting, the query processing problem is to compute the set of tuples representing the answer of a given query on a given database. In the probabilistic setting, this problem becomes the computation of all pairs (t, p), where the tuple t is in the query answer in some random world of the input probabilistic database with probability… Show more

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