Re[7]: to_number question

 Jonathan,

Err, I decided to replicate your query - no error ... odd. Am I missing something? Here below is a log of my session. Its Ora v 8.1.7.

peter
.........

SQL> create table subtest
  2 (flag char(1),
  3 num varchar2(10));

Table created.

SQL> insert into subtest values ('A',3);

1 row created.

SQL> insert into subtest values ('C',5);

1 row created.

SQL> insert into subtest values ('D','alpha');

1 row created.

SQL> commit;

Commit complete.

SQL>
SQL> select * from subtest;

F NUM
- ----------

A 3
C 5
D alpha

SQL> select flag,to_number(num) num from subtest   2 where flag in ('A','C');

F NUM
- ----------

A          3
C          5

SQL> select * from
  2 (
  3 select flag,to_number(num) num from subtest   4 where flag in ('A','C')
  5 )
  6 where num > 0;

F NUM
- ----------

A          3
C          5

     *** No Error Here. ***
     

SQL>
SQL> select * from subtest where num > 0; ERROR:
ORA-01722: invalid number

no rows selected

SQL>

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    mailto:pgro_at_bgs.ac.uk



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