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provenance databases iit dbgroup tapp 2015 benchmarking data integration data cleaning missing answers data exchange datalog perm ontology iit generalization provenance week wbdbbig data university of freiburg vldb 2010 debugging icde 2009 nested subqueries edbt 2009 semantics debs 2013 mit stream data management sigmod 2013 university of toronto tapp 2013 data mining dbgroup tapp 2014 ipaw 2013 certain answers uadbs incomplete databases uncertainty patterns counterbalance explanations ibench metadata empirical evaluation bart empirical evaluations vldb 2016 qdb prov why-not summarization interoperability json gprom ptu ldv reproducibility vritualization tapp