Adding proper MYSTIQ link
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## Summary
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Probabilistic databases revolve around so-called possible worlds semantics. An uncertain database is actually a set of possible databases, also termed possible worlds. To run a query on the uncertain database, you run the query (in principle) in each of the possible worlds, and you get a set of possible answers. Define a probability distribution over the possible worlds, and you get a distribution over the possible answers; This pair of an uncertain database and a probability distribution is what is commonly referred to as a probabilistic database.
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Some of the original dichotomy and complexity results in probabilistic databases came out of the MystiQ project.
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* [Efficient query evaluation on probabilistic databases](http://homes.cs.washington.edu/~suciu/tech-report-vldb2004.pdf)
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* [MYSTIQ: a system for finding more answers by using probabilities](http://dl.acm.org/citation.cfm?id=1066277)
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* TECH REPORT: [Efficient query evaluation on probabilistic databases](http://homes.cs.washington.edu/~suciu/tech-report-vldb2004.pdf)
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#### Orion 2.0 (UMD)
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