select device_id,gpa,age
from user_profile
order by gpa asc,age asc;
// order by gpa,age asc; 哪一列如何排,不指定如何排,默认升序
// order by gpa,age; 默认升序排列
select device_id,gpa,age
from user_profile
order by gpa asc,age asc;
// order by gpa,age asc; 哪一列如何排,不指定如何排,默认升序
// order by gpa,age; 默认升序排列