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MystiQ is a system that allows users to define a probabilistic database, then to evaluate SQL queries over this database. MystiQ is a middleware: the data itself is stored in a standard relational database system, and MystiQ is providing the probabilistic semantics. The advantage of a middleware over a reimplementation from scratch is that it can leverage the infrastructure of an existing database engine, e.g. indexes, query evaluation, query optimization, etc. Furthermore, MystiQ attempts to perform most of the probabilistic inference inside the relational database engine.
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