Oracle Execution Plan

Question

Hi!
How come the Oracle execution plan doesn't show inner select statements?
ie:
select s.id, (select name from anothertable where id = s.id)
from subs s
where s.createdate < '20-March-2005'

Answer 1

Which version of database are you running?
When you run the following query on SCOTT schema, what type of plan do you get?
SQL> set autotrace traceonly explain
SQL> select d.*, (select sum(sal) from emp e where e.deptno = d.deptno) from dept d ;
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=327 Bytes=981
          0)
   1    0   SORT (AGGREGATE)
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'EMP' (Cost=2 Card=3333
          3 Bytes=166665)
   3    2       INDEX (RANGE SCAN) OF 'IDX_EMP_DEPTNO' (NON-UNIQUE) (C
          ost=1 Card=33333)
   4    0   TABLE ACCESS (FULL) OF 'DEPT' (Cost=2 Card=327 Bytes=9810)
SQL> disconnect
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production
SQL>