Como adicionar número de sequência para grupos em uma consulta SQL sem tabelas temporárias

create table sometable([group] varchar(10), id int, somedata int)
insert sometable select 'Horses', 9, 11
insert sometable select 'chickens', 19, 121
insert sometable select 'Horses', 29, 123
insert sometable select 'chickens', 49, 124
insert sometable select 'Cows', 98, 1
insert sometable select 'Horses', 99, 2

select
    Record = ROW_NUMBER() over (order by [Group], id),
    [Group],
    GroupSequence = DENSE_RANK() over (order by [Group])
from sometable

Record               Group      GroupSequence
-------------------- ---------- --------------------
1                    chickens   1
2                    chickens   1
3                    Cows       2
4                    Horses     3
5                    Horses     3
6                    Horses     3