Connect by with conditions

Question

In a CONNECT BY query, we specify a PRIOR and then we can have more conditions afterwards. Is there any effect on the result by changing the place of these conditions ?
ex 1
SELECT * FROM
CCC_TAB
CONNECT BY COL1 = COL2
AND a(b)
AND (c=d OR (e=f AND g=h))
AND i-j
Changing to
ex 2
SELECT * FROM
CCC_TAB
CONNECT BY COL1 = COL2
AND (c=d OR (e=f AND g=h))
AND a(b)
AND i-j
Because my problem is in ex1, Oracle 9 gives an 0RA error 01436 : recursive in a loop error, But not in ORACLE 8(same code) , but when you re-arrange it as in ex2, works fine in Oracle 8 & 9
1. Will there be any change in the result set, by chaging from ex1 to ex2 ?
2. Would like to know more information why this happens.
Thanks very much

Answer 1

Example of Connect_by_is_leaf
select
   DEPTNO,
   max(sys_connect_by_path(ENAME,'>')) Names_list
from
   select
     DEPTNO,
     ENAME,
     row_number() over (partition by DEPTNO order by DEPTNO) rn
     from (
        select * from emp ) tab_
where CONNECT_BY_ISLEAF=1
start with rn =1
connect by prior DEPTNO  = DEPTNO
and
prior rn+1 = rn
group by DEPTNO
   DEPTNO NAMES_LIST
       30 >WARD>TURNER>ALLEN>JAMES>BLAKE>MARTIN
       20 >JONES>FORD>ADAMS>SMITH>SCOTT
       10 >CLARK>KING>MILLER