sql - 存在に関係なく値を返すクエリを作成する方法は?

Question

これを考えると：

   with data_row as  (select 1 as col_1 from dual)
   select 'Y' as row_exists from dual where exists 
   (select null 
       from data_row
      where col_1 in (2,1))

どうすればこれを入手できますか?

Col_1  Row_exists
--------------------
1       Y
2       N