使用子查询方法

# select emp_no,birth_date,first_name,last_name,gender,hire_date from
# (select *,dense_rank() over(order by hire_date desc) as rank1
# from employees e)a
# where rank1=3

select * from employees where hire_date=
(select distinct(a.hire_date)
from employees a,employees b
where a.hire_date<=b.hire_date
group by a.emp_no
having count(distinct b.hire_date)=3)