题解 | #将所有to_date为9999-01-01的全部更新为NULL#
获取Employees中的first_name
http://www.nowcoder.com/practice/74d90728827e44e2864cce8b26882105
select first_name from employees order by substring(first_name,-2)
select first_name from employees order by substr(first_name,-2 )
select first_name from employees order by right(first_name,2)
这三种方法都可以实现