Re: 9205 Query behavior
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 18 May 2004 13:05:04 +0300
> When trying out hints I only focused on no_unnest and totally forgot about
> no_merge which should have been the more obvious one. That is consistent
> with the result I got using the rownum pseudo-column which also prevents
> merging.
NO_MERGE causes CBO to be used and under CBO the query works correctly (even
without NO_MERGE) as Connor pointed out.
If you set _complex_view_merging to false, then the query works ok under RBO
as well...
SQL> select * from ( select distinct deptno from ( select deptno, job,
2 min(sal) from scott.emp group by deptno, job ) where deptno = 20 )
3 /
DEPTNO
----------
20
20
20
SQL> alter session set "_complex_view_merging"=false;
Session altered.
SQL> select * from ( select distinct deptno from ( select deptno, job,
2 min(sal) from scott.emp group by deptno, job ) where deptno = 20 )
3 /
DEPTNO
----------
20
Tanel.
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