Invalid Number in View

Question

Hi,
How we can find out the offended join in the view query which is giving Invalid Number error, view structure is huge. Tables are having lots of data.
Suggestions/comments are welcome.
Thanks in Advance
Tehzeeb

Answer 1

Hello
I wouldn't have thought so. If you are joining a character column to a numeric column, it could be the source of the problem...
SQL> create table dt_test_num(id number)
  2  /
Table created.
SQL> create table dt_test_vc(id varchar2(10))
  2  /
Table created.
SQL> insert into dt_test_num values(1);
1 row created.
SQL> insert into dt_test_vc values('1');
1 row created.
SQL> insert into dt_test_num values(2);
1 row created.
SQL> insert into dt_test_vc values('A');
1 row created.
SQL> select a.*,b.* from dt_test_num a,dt_test_vc b where a.id=b.id;
select a.*,b.* from dt_test_num a,dt_test_vc b where a.id=b.id
ERROR at line 1:
ORA-01722: invalid numberI'm on 8i so I can't demonstrate the dbms_xplan stuff, but in the predicates section for this query, it should show you that behind the scenes, the optimiser has put TO_NUMBER(b.id) as one of the predicates. This could be what is happening in your case. Worth a look.
HTH
David