with joined_Result as 
(
  select * 
  from table1 t1 
    full outer join 
       table2 t2
  on ( t1.composite_key_col1 = t2.composite_key_col1 
   and t1.composite_key_col2 = t2.composite_key_col2 
   and t1.composite_key_col3 = t2.composite_key_col3 
)

with joined_Result as 
(
  select * 
  from table1 t1 
    full outer join 
       table2 t2
  on ( t1.composite_key_col1 = t2.composite_key_col1 
   and t1.composite_key_col2 = t2.composite_key_col2 
   and t1.composite_key_col3 = t2.composite_key_col3 
)
select * 
from joined_result
where decode(t1.col1,t2.col1,1,0) = 0
 or decode(t1.col2,t2.col2,1,0) = 0
 or decode(t1.col3,t2.col3,1,0) = 0
..