I try to do the following: Fetch a SERIAL field (ie. record_id) and get the highest value currently stored (ie. 1000), increment the value by 1 and store a record that will have the same value (1001) in record_id. So there must be a way with concurrency control. I went through the manuals and found the solution with NEXTVAL('serial'), but you have to create a sequence for that, and I don't know if it is the right way to do for what I want. It is my first PHP project involving a Database, so it's a newbie question. Have mercy... Thanks __________________________________________________ Do You Yahoo!? Make a great connection at Yahoo! Personals. http://personals.yahoo.com