Dont show fields with same value as previous row.

Hi, If I have a table like this:
DEPNO_MONTH__COST__ID
10_____ Jan______100___ 2
10_____ Jan______200___ 4
10_____ Jan_______50____3
20_____ Feb______30____4
30_____ Jan ______30____5
30_____ Feb______40____6
I need a select that shows the table like this:
DEPNO_MONTH_COST_ID
10______Jan_____100___2
________________200___4
________________50____3
20______Feb_____30____4
30______Jan_____30____5
________Feb_____40____6
Can someone please help me? (ingore underscore)
/Sören

like this ?
SQL> select decode(rno1, 1, depno, null) depno,
2         decode(rno2, 1, mon, null) month,
3         cost, id
4    from (select depno,
5                 mon,
6                row_number() over (partition by depno order by depno, mon, cost ) rno1,
7                row_number() over (partition by depno, mon order by depno, mon, cost ) rno2,
8                cost, id
9           from t1
10         order by depno, mon, cost );
     DEPNO MONTH            COST         ID
        10 Jan                50          3
                             100          2
                             200          4
        20 Feb                30          4
        30 Feb                40          6
           Jan                30          5
6 rows selected.
SQL>
[pre]

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