获取当前薪水第二多的员工的emp_no以及其对应的薪水

select s.emp_no,s.salary,e.last_name,e.first_name from salaries s join employees e on e.emp_no = s.emp_no where s.salary = (select max( distinct a.salary) from salaries a join salaries b on a.salary< b.salary);