Generating number depending on the condition

Dear All,
I have table with following structure.
formno          number(5)
name          Varchar2(100)
centreno     number(2)
rollno          Varchar2(10)
I want to generate rollno depending on the following condition.
1. Roll number should be generated based on the centreno
2. Roll number should be generated based on the alphabets but not in a sqeuence.
For eg.
my data is like
form no     name     centreno     rollno
200           A1      01           1
206           A2      01           4
502           A3      02           6
234           A4      03           10
400           B1      01           2
501           B2      02           7
788           C1      01 3
100           C2 02           8
343           C3      01           5
130           C4      02           9
232           C5      03           11
i.e. first I need to sort names alphabetically by centreno. But then I need generate number in a sequence that first A, B, C...Z will be generated. Then it starts again from A, B, C...Z for that centre. Then it will run same process for other centres.
Any ideas how to do this?
Regards
Trusha
Edited by: trusha on Oct 10, 2008 3:53 PM

Something like .. (for given sample data)
SQL> select * from test;
        C1 C2 C3
       200 A1 01
       206 A2 01
       502 A3 02
       234 A4 03
       400 B1 01
       501 B2 02
       788 C1 01
       100 C2 02
       343 C3 01
       130 C4 02
       232 C5 03
11 rows selected.
SQL> select c1,c2,c3,
2    row_number() over(order by c3,rn,c2) regno
3 from(
4 select c1,c2,c3,
5   row_number() over(partition by c3,substr(c2,1,1) order by c2) rn
6 from test)
7 order by c2;
        C1 C2 C3      REGNO
       200 A1 01          1
       206 A2 01          4
       502 A3 02          6
       234 A4 03         10
       400 B1 01          2
       501 B2 02          7
       788 C1 01          3
       100 C2 02          8
       343 C3 01          5
       130 C4 02          9
       232 C5 03         11
11 rows selected.
Edited by: jeneesh on Oct 10, 2008 4:51 PM
corrected

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