Subquery inside NVL using a view

Question

Hello
A subquery can not be used inside a NVL.
But I read that it can be done using a view.
Can any one give an example of how we can acheive the effect of NVL (select statement, <expr>) using a view.
(Just in general ....)
Thank you

Answer 1

Who said that
SQL>SELECT empno
  2        ,ename
  3        ,comm
  4       ,NVL(to_char(comm), (SELECT 'Commision is NULL' FROM DUAL))  null_comm
  5    FROM emp ;
     EMPNO ENAME            COMM NULL_COMM
      7369 SMITH                 Commision is NULL
      7499 ALLEN             300 300
      7521 WARD              500 500
      7566 JONES                 Commision is NULL
      7654 MARTIN           1400 1400
      7698 BLAKE                 Commision is NULL
      7782 CLARK                 Commision is NULL
      7788 SCOTT                 Commision is NULL
      7839 KING                  Commision is NULL
      7844 TURNER              0 0
      7876 ADAMS                 Commision is NULL
      7900 JAMES                 Commision is NULL
      7902 FORD                  Commision is NULL
      7934 MILLER                Commision is NULL
14 rows selected.
SQL>Regards
Arun