One last question

From: Jonathan Gennick <jonathan_at_gennick.com>
Date: Fri, 16 Jul 2004 21:01:58 -0400
Message-ID: <1571111499121.20040716210158@gennick.com>

Wolfgang,

One last question, and then I'm done for the night. Here's that query again:

SQL> SELECT *
  2 FROM ( SELECT flag, TO_NUMBER(num) num

  3         FROM subtest
  4         WHERE flag IN ('A', 'C') )

  5 WHERE num > 0;
ERROR:
ORA-01722: invalid number

How can I know whether it is "num > 0" that is causing the error? Could it be that TO_NUMBER(num) is being evaluated *before* the subquery's WHERE clause filters out rows NOT IN ('A', 'C')?

In other words, how can I know that the problem I'm seeing is really the result of the two queries being merged?

Best regards,

Jonathan Gennick --- Brighten the corner where you are http://Gennick.com * 906.387.1698 * mailto:jonathan@gennick.com

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Received on Fri Jul 16 2004 - 19:58:31 CDT