Re: Function PostgreSQL 9.2

CREATE OR REPLACE FUNCTION users_code_seq()
   RETURNS "trigger" AS $$
BEGIN
        
        IF (TG_OP = 'INSERT') THEN
        UPDATE public.company_seqs SET last_seq = (last_seq + 1) WHERE company_id = NEW.company_id;
        
        ELSEIF NEW.code IS NULL THEN
        SELECT last_seq INTO code FROM public.company_seqs WHERE company_id = NEW.company_id ORDER BY last_seq DESC;
        
        END IF;
        
        RETURN NEW;
        
END;
$$ LANGUAGE plpgsql;