mysql 字符串先按照长度排序再按照ASCII码排序

方法一：先按照长度排序再按照ASCII码排序

select display_name from desktop order by display_name desc, length(display_name) desc;

方法二：向前/左用空格补齐32位后再排序

select display_name from desktop order by LPAD(display_name, 32, ' ') desc;

补充：向后/右补齐为RPAD(str,len,padstr)