Hello everyone, I have he following situation: I have a 'base' table called Problem and 5 other tables that inherit Problem: MultipleChoiceProblem, TrueFalseProblem, EssayProblem, NumericProblem and MatchProblem I want to do the following query: SELECT * FROM Problem; But Problem is empty, since I fill only the derived tables. How can I make this query? Thanks for your help in advance! Regards, Stephan -- Stephan Richter CBU - Physics and Chemistry Student Web2k - Web Design/Development & Technical Project Management