Thanks again for your really helpful reply.

This gives me below output :

rollnonameclassSortOrder

1RobertIT1

1DavidScience2

1MichelCommerce4

1AlbertGeography5

1RichardHistory6

2HussainIT1

2JonathanScience2

2JohnArts3

3PoloIT1

4JosephHistory6

Kindly tell me how do i get required i.e. row number 1,6,9 and 10 please. This grouping is making me crazy.

Thanks and Regards

Girish Sharma