Please post DDL, so that people do not have to guess what the keys,
constraints, Declarative Referential Integrity, data types, etc. in
your schema are. If you know how, follow ISO-11179 data element naming
conventions and formatting rules, so that people can read your posting
and understand it (i.e names like Table_A is pretty useless). Sample
data is also a good idea, along with clear specifications. It is very
hard to debug code when you do not let us see it. If you want to
learn how to ask a question on a Newsgroup, look at:
http://www.catb.org/~esr/faqs/smart-questions.html <<