Query only non numeric values in a column

Question

How to query only non numeric values in a cloumn.
For example:
Table1 has a column1(col1)
Values:
Row Value
1 27376
2 47D99
3 83039
4 DKFI*
5 3J6
Query should retrieve only rows(2,4,5).
Thanks! for help
Murali

Answer 1

Version 2(PL/SQL) above is not clear enough, It can be tuned to the following:
-- Create a function
Create or replace function IsVARCHAR(pCol VARCHAR2) return VARCHAR2
AS
vNumber NUMBER := 0;
begin
  vNumber := to_number(pCol);
  RETURN NULL;
Exception
  When Others Then
    RETURN pCol;
End;
-- To See VARCHAR values (alpha-numeric) only!
SELECT col1 FROM tab1
WHERE IsVARCHAR(col1) IS NOT NULL;
-- To See NUMBER values only!
SELECT col1 FROM tab1
WHERE IsVARCHAR(col1) IS NULL;Versatility here with PL/SQL, but I personally like SQL versions.
Thx,
SriDHAR