SQL meaning

Hi

I have the following query for an Identity Management Tool:

SELECT userobj.ID, NAME, summary

    FROM userobj
   WHERE userobj.NAME LIKE 'A%'

     AND userobj.ID IN (
            SELECT ID
              FROM userattr
             WHERE (   attr1 IN ('#ID#TOP')
                    OR attr1 IN (
                          SELECT ID
                            FROM orgattr
                           WHERE orgattr.attrname = 'CONTAINEDBYOBJECTGROUP'
                             AND attrval IN ('#ID#TOP'))
                   ))

select table_name, num_rows, last_analyzed from dba_tables where table_name in
('USEROBJ', 'USERATTR', 'ORGATTR');

TABLE_NAME                       NUM_ROWS LAST_ANAL
------------------------------ ---------- ---------
USERATTR                          1851675 20-OCT-08
USEROBJ                             64972 20-OCT-08
ORGATTR                              2251 20-OCT-08

I am having difficulty understanding the query, for example the condition " attr1 IN ('#ID#TOP') " can it be taken out to the outer query and not used in the subquery?

TIA Alex

--
http://www.freelists.org/webpage/oracle-l