TO_NUMBER function on varchar2 column with numbers and strings

I need to create a column in a view that converts a varchar2 column data to number. The problem is that some
of the data have strings and some numbers. I get "ORA-01722: invalid number" error when Oracle tries to covert
strings (e.g. 'ABCD') to number. What I need is to get a NULL value if the data is an invalid number.
How can I rewrite the following to get NULL value is a string is invalid number?
select to_number('abcd') numberColumn
from dual
thanx
Alfred

SQL> select * from test_char_num;
ALPHA_NUM
ABC
DEF
123
234
A12
SQL> select decode(NVL(length(trim(translate(alpha_num, '1234567890', ' '))), 0),
2 0, alpha_num, 'NULL') new_alpha_num
3 from test_char_num;
NEW_ALPHA_
NULL
NULL
123
234
NULLP.S I am printing 'NULL' just to show the result, Please replace the 'NULL string with NULL value in SQL.
Thx,
Sri

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TO_NUMBER function on varchar2 column with numbers and strings

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