Parke Godfrey Jarek Gryz Calisto Zuzarte Exploiting Constraint-Like Data Characterizations in Query Optimization. 582-592 2001 SIGMOD Conference db/conf/sigmod/sigmod2001.html#GodfreyGXZ01 http://doi.acm.org/10.1145/375663.375749 http://www.acm.org/sigs/sigmod/sigmod01/eproceedings/papers/Industrial-Godfrey-et-al.pdf