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This demonstration presents FlexPref, a framework implemented inside the DBMS query processor that enables efficient and extensible preference query processing. FlexPref provides query processing support inside the database engine for a wide-array of preference evaluation methods (e.g., skyline, top-k, k-dominance, k-frequency) in a single extensible code base. Integration with FlexPref is simple, involving the registration of only three functions that capture the essence of the preferencedoi:10.1145/1807167.1807331 dblp:conf/sigmod/LevandoskiMKK10 fatcat:6zdlygetuff5xmtsucthnseipm