mysql查询分类每个分类前三条数据

select t.* 
from
(
select t1.*,(select count(t2.id)+1 from cf_component t2 where t2.whereId=t1.whereId and t2.updatedDate>t1.updatedDate) as count_id
from cf_component t1
) t 
where t.count_id<=3

t2.whereId=t1.whereId 类型字段
t2.updatedDate>t1.updatedDate 排序字段