数据库

mysql 超过5名学生的课

云博小周宇1 Min Read 
select class
from
(
select distinct student, class
from courses 
) t
group by class 
having count(class)>=5

脚本如下：

select class
from
(
select distinct student, class
from courses 
) t
group by class 
having count(class)>=5

注意 可能有重复记录