How to write a query for giving order number

hi,
we are using 10gR2:
I have data in the following format, I want group_nr based on month_nr ( and it can start with any month)
month_nr    group_nr
4                    1
4                    1
5                    2
5                    2
5                    2
5                    2
5                    2
6                    3
6                    3
6                    3
Thanks

select month_nr,
          dense_rank() over (order by month_nr) group_nr
from mytable
Ramin Hashimzade

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