我有一些不同的用户名,代表组,例如GRP_BSN.

我想将所有其他用户名(恰好是数字)分组到一个组中,例如GRP_OTHERS

select username,count(*)
from host
where seq between 0 and 2000
group by username;

63149   1
63732   1
64110   2
70987   12
76841   4
GRP_BSN 226
GRP_ASN 243
GRP_DSC 93

我可以实现这样的目标：

GRP_OTHERS 20
GRP_BSN 226
GRP_ASN 243
GRP_DSC 93

编辑：从答案修改查询

select username,count(*)
from host
  where created_dt 
  -- date selection
  between to_date('2012-may-23 00:00:00','yyyy-mon-dd hh24:mi:ss') 
  and to_date('2012-may-23 23:59:59','yyyy-mon-dd hh24:mi:ss')
GROUP BY CASE
             WHEN REGEXP_LIKE(username,'^\d+$') THEN 'GRP_OTHERS'
                                                 ELSE username
         END;