Can we use partition with condition?

Hi,
I want to partition the table using a coumn, and some conditions on the columns. Can we do this?
Any suggesitions are welcome.
Thanks and regards
Gowtham Sen.

Something like
  1  select ename,
  2         sal,
  3         deptno,
  4         lag( sal ) over ( partition by (case when deptno <= 15
  5                                              then 'Low'
  6                                              else 'HIGH'
  7                                          end)
  8                           order by sal ) prev_sal
  9*   from emp
SCOTT @ nx102 JCAVE9420> /
ENAME             SAL     DEPTNO   PREV_SAL
SMITH             800         20
JAMES             950         30        800
ADAMS            1100         20        950
WARD             1250         30       1100
MARTIN           1250         30       1250
TURNER           1500         30       1250
ALLEN            1600         30       1500
BLAKE            2850         30       1600
JONES            2975         20       2850
FORD             3000         20       2975
SCOTT            3000         20       3000
MILLER           1300         10
CLARK            2450         10       1300
KING             5000         10       2450
14 rows selected.
Elapsed: 00:00:00.04Justin

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