Christian Goldberg Stefan Brass Semantic Errors in SQL Queries: A Quite Complete List. 58-62 2004 conf/gvd/2004 Grundlagen von Datenbanken http://www.dbs.cs.uni-duesseldorf.de/gvd2004/papers/Goldberg-Brass.pdf db/conf/gvd/gvd2004.html#GoldbergB04