一時テーブルを使用せずに SQL クエリでグループのシーケンス番号を追加する方法

サンプルデータ

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
  

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

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