Char conversion to number

Hai all,
I have a colmn called Kilometers in table of datatype varchar and has got morethan 20,000 numeric records in it.. only numbers are getting stored in that column.. now am creating one more table with column called kiometres with datatype number..
I want to insert the records of table A.Kilometres to B.Kilometres.. I tried the follwoing :
insert into project_mileage (kilometres) select (to_number(kilometres,'9999999')) from project
am getttin the error :
ora-01722. invalid number.
how can I get the records inserted..
Thanks
Kai

If your data doesn't include other characters but numbers, you could rely on the implicit datatype conversion:
SQL> create table a(a varchar2(3));
Table created.
SQL> create table b(b number(3));
Table created.
SQL> insert into a values ('1');
1 row created.
SQL> insert into a values ('2');
1 row created.
SQL> insert into a values ('3');
1 row created.
SQL> commit;
Commit complete.
SQL> insert into b select * from a;
3 rows created.
SQL> commit;
Commit complete.
SQL> select * from b;
         B
         1
         2
         3
SQL>~ Madrid

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JTF.JTY_TRANS_USG_PGM_SQL|REAL_TIME_INSERT 6 0 0
JTF.JTY_TRANS_USG_PGM_SQL|REAL_TIME_SQL 6 0 0
ODM.ODM_PMML_DTD|DTD 1 0 0
OKC.OKC_REPORT_SQL_B|SQL_TEXT 3 0 0
OKC.OKC_REPORT_SQL_TL|HELP_TEXT 2 0 0
OKC.OKC_REPORT_XSL_TL|HELP_TEXT 2 0 0
OKC.OKC_REPORT_XSL_TL|XSL_TEXT 3 0 0
XDP.XDP_PROC_BODY|PROC_BODY 10 0 0
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