On 4 May 2016 at 01:18, Melvin Davidson <melvin6...@gmail.com> wrote:
> > > On Tue, May 3, 2016 at 1:21 AM, David G. Johnston < > david.g.johns...@gmail.com> wrote: > >> >>> Well.. I don't need to add a constraint if I already have a default >>> value, that's right... >>> >> >> Wrong >> >> David J. >> > > What you need is a TRIGGER function & TRIGGER that will select and assign > the next users_code based on company_id. > I'm not going to write the whole thing for you, but here is part of the > trigger function logic. > > eg: IF NEW.company_id = 1 THEN > NEW.users_code = NEXTVAL(c1_users_code_seq); > ELSEIF NEW.company.id = 2 THEN > NEW.users_code = NEXTVAL(c2_users_code_seq); > ELSEIF NEW.company.id = 3 THEN > NEW.users_code = NEXTVAL(c3_users_code_seq); > ... > ... > ELSE > < something bad happened because NEW.company_id was not valid > ? > END IF; > > > Do I have to have one sequence peer company_id ? There will be thousands.. isn't there a better way to do that? > Seriously, get yourself the books I have recommended and study them > BEFORE you continue attempting to design your database. > You need a firm understanding of logical design & flow, otherwise you will > be wasting your time. > That's what I'm doing.. Studying.. asking for some help to get a better understand.... isn't this the purpose of this mail list?
