mysql 字符串先按照長度排序再按照ASCII碼排序

方法一：先按照長度排序再按照ASCII碼排序

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

 

方法二：向前/左用空格補齊32位后再排序

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

 

補充：向后/右補齊為RPAD(str,len,padstr)