create table LookupTable ( key number, value varchar2(100) ) ;

insert into LookupTable values( 1, 'YAMAHA' ); 

commit;


create or replace function lookup(l_input number) return varchar2
as
  l_output LookupTable.value%TYPE;
begin
  select value into l_output from LookupTable where key = l_input;
  return l_output;
end;
/


select lookup(1) from all_objects;


update LookupTable set value = 'YAMAHA2' where key = 1;

commit;

