题解 | #获取Employees中的first_name#
获取Employees中的first_name
http://www.nowcoder.com/practice/74d90728827e44e2864cce8b26882105
select first_name from employees order by substr(first_name, length(first_name)-1) asc
假设first_name是mysql，length(mysql)=5,length(mysql)-1=4,substr(mysql,4)索引从1开始，4是q，没有说明取多少个字符则取到结束，结果是ql 假设first_name是first_name，length(first_name)=10,length(first_name)-1=9,substr(first_name,first_name)索引从1开始，9是m，没有说明取多少个字符则取到结束，结果是me
