RE: How to inhibit that subquery merging behavior

"Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx> · Sun, 18 Jul 2004 07:45:49 -0400

Jonathan,
Did you try putting rownum in the sub-query's select list?
select *
from ( select flag, to_number(num) num, rownum
       from subtest
       where flag in('A','C'))
where num > 0;

-----Original Message-----
From:   oracle-l-bounce@xxxxxxxxxxxxx on behalf of Jonathan Gennick
Sent:   Fri 7/16/2004 8:59 PM
To:     Wolfgang Breitling
Cc:     
Subject:        How to inhibit that subquery merging behavior
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@xxxxxxxxxxx

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