On 4 May 2016 at 01:18, Melvin Davidson <melvin6925@xxxxxxxxx> wrote:
On Tue, May 3, 2016 at 1:21 AM, David G. Johnston <david.g.johnston@xxxxxxxxx> wrote:Well.. I don't need to add a constraint if I already have a default value, that's right...WrongDavid J.NEW.users_code = NEXTVAL(c1_users_code_seq);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 THENELSEIF NEW.company.id = 2 THENNEW.users_code = NEXTVAL(c2_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?
