Steel Bundle Machine, just as its name implies, it is used to bundle the steel wire got from tire pyrolysis plant. The steel wire is very thin and mussy because it is separated from waste tires. Using steel bundle machine could make the steel wire into tidy bulks which size depends on demands.
select count(*) from student group by yuanxi_id;
select yuanxi_id from student group by yuanxi_id having count(*) >= all(select count(*) from student group by yuanxi_id);
select yuanxi_name from yuanxi where id in(select yuanxi_id from student group by yuanxi_id having count(*) >= all(select count(*) from student group by yuanxi_id));
