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Preferences are a well-established framework for database queries with soft constraints. Such queries select the best objects from large data sets according to a strict partial order induced by intuitive and semantically rich preference constructors. Together with functionality like grouping and aggregation, adapted from well-known database mechanisms, a very flexible preference framework has emerged in the last decade. In this paper we present R-Pref, an implementation of the preferencedoi:10.5220/0004590301040111 dblp:conf/data/RoocksK13 fatcat:ruezqjzajvgbfhfmh5di42b5ky