Hi German,

You can find several articles on Stored Procedures and Triggers at:

http://www.ibphoenix.com/a418.htm?a=ibphoenix&s=1096817336:414488&page=ibp_document

It was enough to get me going.

Not sure, but I don't think you can abort execution of a sql statement
in a trigger. Probably a stored
procedure is better suited to tackle your problem.