How to inhibit that subquery merging behavior

From: Jonathan Gennick <jonathan_at_gennick.com>
Date: Fri, 16 Jul 2004 20:59:44 -0400
Message-ID: <1581111365068.20040716205944@gennick.com>

Wolfgang,

I can reproduce the error:

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

However, I can't find a hint that will prevent the merging of the subquery. I've tried Tanel's suggestions:

SQL> SELECT /*+ NO_MERGE(sub) NO_PUSH_PRED(sub) PUSH_SUBQ(sub) */ *   2 FROM ( SELECT flag, TO_NUMBER(num) num

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

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

I've also tried putting the hints into the subquery:

SQL> SELECT *
  2 FROM ( SELECT /*+ NO_MERGE NO_PUSH_PRED PUSH_SUBQ */

  3            flag, TO_NUMBER(num) num
  4         FROM subtest
  5         WHERE flag IN ('A', 'C') ) sub

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

Is there a hint that will prevent the queries from 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 - 19:56:19 CDT