Converting SQL into PL/SQL

Hi All,
I have emp table with data as below,
SELECT EMPNO,MGR FROM EMP;
EMPNO|MGR
7369|7902
7499|7698
7521|7698
7566|7839
7654|7698
7698|7839
7782|7839
7788|7566
7839|
7844|7698
7876|7788
7900|7698
7902|7566
7934|7782
When ever new emp_id's are generated as shown below, I want to update them for MGR Id's as well, so I have written below query and am getting that and output is also attached,
SELECT new_emp,new_mgr_id, SYSDATE
FROM (WITH ngr AS
(SELECT empno, (select max(empno) from emp) + rownum new_emp,mgr
FROM emp e
START WITH e.mgr is null
CONNECT BY PRIOR e.empno=e.mgr)
SELECT t1.*,
NVL ((SELECT new_emp
FROM ngr t2
WHERE t2.empno = t1.mgr),
99999
) new_mgr_id
FROM ngr t1)
NEW_EMP|NEW_MGR_ID|SYSDATE
7935|99999|12/11/2009 12:57:16 AM
7936|7935|12/11/2009 12:57:16 AM
7937|7936|12/11/2009 12:57:16 AM
7938|7937|12/11/2009 12:57:16 AM
7939|7936|12/11/2009 12:57:16 AM
7940|7939|12/11/2009 12:57:16 AM
7941|7935|12/11/2009 12:57:16 AM
7942|7941|12/11/2009 12:57:16 AM
7943|7941|12/11/2009 12:57:16 AM
7944|7941|12/11/2009 12:57:16 AM
7945|7941|12/11/2009 12:57:16 AM
7946|7941|12/11/2009 12:57:16 AM
7947|7935|12/11/2009 12:57:16 AM
7948|7947|12/11/2009 12:57:16 AM
Now my problem is, I want to get the same requirement by replacing *(select max(empno) from emp) + rownum new_emp* with sequence,
(or) the same logic in one Procedure, am trying but facing some difficulties, can any one help me in acheiving this,
thanks,
sunil

Hi Munky and all,
Sorry if I have not made you clear,
ok let me tell my requirement clearly,
I have EMP Table with Data as shown below,
SELECT empno oldempno, emp_name NAME, mgr oldmgrno
FROM emp;
Output:
OLDEMPNO|NAME|OLDMGRNO
7369|SMITH|7902
7499|ALLEN|7698
7521|WARD|7698
7566|JONES|7839
7654|MARTIN|7698
7698|BLAKE|7839
7782|CLARK|7839
7788|SCOTT|7566
7839|KING|
7844|TURNER|7698
7876|ADAMS|7788
7900|JAMES|7698
7902|FORD|7566
7934|MILLER|7782
Now my requirement is when ever any empno is changed in the table and if that emp is a manager to any other employee, number of that employee should also change automatically with in a single query,
and I have acheived the requirement by using the below query,
SELECT new_emp, NAME, new_mgr_id
FROM (WITH ngr AS
(SELECT empno, *(SELECT MAX (empno)*
FROM emp) + ROWNUM new_emp, emp_name NAME,
mgr
FROM emp e
START WITH e.mgr IS NULL
CONNECT BY PRIOR e.empno = e.mgr)
SELECT t1.*, NVL ((SELECT new_emp
FROM ngr t2
WHERE t2.empno = t1.mgr), 99999) new_mgr_id
FROM ngr t1)
and so output is below,
NEW_EMP|NAME|NEW_MGR_ID
7935|KING|99999
7936|JONES|7935
7937|SCOTT|7936
7938|ADAMS|7937
7939|FORD|7936
7940|SMITH|7939
7941|BLAKE|7935
7942|ALLEN|7941
7943|WARD|7941
7944|MARTIN|7941
7945|TURNER|7941
7946|JAMES|7941
7947|CLARK|7935
7948|MILLER|7947
Now my problem/requirement is I want to use Sequence in place of this query *(SELECT MAX (empno) FROM emp) + ROWNUM new_emp,* but as with clause and subquery clause dosen't allow me to do that, am in vain how to implement that,
So solution to my problem would be a SQL or PL/SQL that can do this operation
Please let me know how to acheive it,
Thanks,
Sunil .N

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