这道题要用到一个联合表的查询结果的操作,关键词为union

由于不对结果去重,所以为union all

select device_id,
gender,
age,
gpa 
from user_profile
where university = '山东大学'

union all
select device_id,
gender,
age,
gpa 
from user_profile
where gender = 'male';