Oracle SQL: MINUS ALL

create table tq84_minus_1 (val  number);
create table tq84_minus_2 (val  number);
 
begin

   insert into tq84_minus_1 values (1);

   insert into tq84_minus_1 values (2);
   insert into tq84_minus_1 values (2);

   insert into tq84_minus_1 values (3);
   insert into tq84_minus_1 values (3);
   insert into tq84_minus_1 values (3);

   insert into tq84_minus_1 values (4);
   insert into tq84_minus_1 values (4);
   insert into tq84_minus_1 values (4);
   insert into tq84_minus_1 values (4);
 
   ------------------------------------

   insert into tq84_minus_2 values (2);
   insert into tq84_minus_2 values (3);

   insert into tq84_minus_2 values (4);
   insert into tq84_minus_2 values (4);

   commit;
end;
/

select val from tq84_minus_1 minus all
select val from tq84_minus_2;
--
--        VAL
-- ----------
--          1
--          2
--          3
--          3
--          4
--          4

drop table tq84_minus_1;
drop table tq84_minus_2;