select 姓名
from 成绩表
group by 姓名
having count(case when 成绩<60 then 1 end)=0
或者
select 姓名
from 成绩表
where 姓名 not in (select 姓名 from 成绩表 where 成绩<60)
select 姓名 from 表 group by 姓名 having avg(成绩) >=60
select * from test where name not in(select name from test where score>=60 group by name)