在SQL Server中，请看下表中的学生结构：
rollno int
name varchar(20)
course varchar(20)
如何查询才能显示注册学生人数超过 5 人的课程？( )
Select course from students where count(course) > 5;
Select course from students where count(*) > 5 group by course;
Select course from students group by course;
Select course from students group by course having count(*) 5;
Select course from students group by course where count(*) 5;
Select course from students where count(group(course)) 5;
