Re: 9205 Query behavior
- From: Wolfgang Breitling <breitliw@xxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 17 May 2004 09:42:34 -0600
I wonder what kind of optimizer bug it is. I tried various hints, even RULE
!, to no avail. However, adding rownum to the innermost sql produces the
expected result:
SQL> l
1 select distinct deptno from ( select rownum, deptno, job,
2* min(sal) from scott.emp group by rownum, deptno, job)
SQL> /
DEPTNO
----------
10
20
30
3 rows selected.
SQL> l
1 select * from ( select distinct deptno from ( select rownum, deptno, job,
2* min(sal) from scott.emp group by rownum, deptno, job) where deptno = 20 )
SQL> /
DEPTNO
----------
20
1 row selected.
That seems to indicate some unnesting related error. However, using
no_unnest hints does not change the behaviour.
At 03:55 PM 5/16/2004, you wrote:
>On 9205 database, load $OH/admin/utlsampl.sql
>
>run following query ... and observe ...
>
>set feedback on
>prompt Step 1
>select deptno, job, min(sal) from scott.emp group by deptno, job
>/
>prompt Step 2
>select distinct deptno from ( select deptno, job, min(sal) from
>scott.emp group by deptno, job ) where deptno = 20
>/
>prompt Step 3
>select * from ( select distinct deptno from ( select deptno, job,
>min(sal) from scott.emp group by deptno, job ) where deptno = 20 )
>/
regards
Wolfgang Breitling
Centrex Consulting Corporation
www.centrexcc.com
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