How to join this two tables

Question

Hi
have a two login in forms not in oracle... i have two tables first the
Master secodn the Employees.. my prob is i have two button for this two tables to login.. any solution on how i can join this two in one button that if i connect using from master tables or from employess it will login
FirstTAble:::
BEGIN
iF :username IS NULL THEN
MESSAGE ('Please enter Username ');
MESSAGE ('Please enter Username ');
GO_ITEM('username');
RAISE FORM_TRIGGER_FAILURE;
end if;
IF :PASSNAME1 IS NULL THEN
MESSAGE('Please enter password.');
MESSAGE('Please enter password.');
GO_ITEM('PASSNAME1');
RAISE FORM_TRIGGER_FAILURE;
end if;
select username,passname
into :pass.username,:pass.passname1
from Master
where :pass.username=username
and :pass.passname1=passname;
Message('Access Granted');
Message('Access Granted');
go_block('maina');
hide_view('pass1');
exception
when no_Data_found then
set_alert_Property('wrong',Alert_Message_text,'Invalid Password');
if show_alert('wrong')=alert_button1 then
          go_item('PASSNAME1');
          :passname1:=null;
          end if;
end;
SEcodnTAble
BEGIN
iF :username IS NULL THEN
MESSAGE ('Please enter Username ');
MESSAGE ('Please enter Username ');
GO_ITEM('username');
RAISE FORM_TRIGGER_FAILURE;
end if;
IF :PASSNAME1 IS NULL THEN
MESSAGE('Please enter password.');
MESSAGE('Please enter password.');
GO_ITEM('PASSNAME1');
RAISE FORM_TRIGGER_FAILURE;
end if;
select username,passname
into :pass.username,:pass.passname1
from Employees
where :pass.username=username
and :pass.passname1=passname;
Message('Access Granted');
Message('Access Granted');
go_block('maina');
hide_view('pass1');
exception
when no_Data_found then
set_alert_Property('wrong',Alert_Message_text,'Invalid Password');
if show_alert('wrong')=alert_button1 then
          go_item('PASSNAME1');
          :passname1:=null;
          end if;
end;

Answer 1

use a union on the 2 select statements.