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cs.DB2018
Universal (and Existential) Nulls
Gösta Grahne, Ali Moallemi
Incomplete Information research is quite mature when it comes to so called {\em existential nulls}, where an existential null is a value stored in the database, representing an unk…
cs.DB2013
Conditional Tables in practice
Gosta Grahne, Adrian Onet, Nihat Tartal
Due to the ever increasing importance of the internet, interoperability of heterogeneous data sources is as well of ever increasing importance. Interoperability can be achieved e.g…
cs.DB2013
Anatomy of the chase
Gosta Grahne, Adrian Onet
A lot of research activity has recently taken place around the chase procedure, due to its usefulness in data integration, data exchange, query optimization, peer data exchange and…