方法一(窗口函数):select emp_no,birth_date,first_name,last_name,gender,hire_date from ( select *,dense_rank () over (order by hire_date desc) a from employees ) as univ_min WHERE a=3; 方法二(limit):SELECT * FROM employees WHERE hire_date = ( SELECT DISTINCT hire_date FROM employees ORDER BY hire_date DESC LIMI...