题解 | 获取当前薪水第二多的员工的emp_no以及其对应的薪水salary

select e.emp_no,s.salary,e.last_name,e.first_name
from employees e join salaries s on e.emp_no = s.emp_no
where salary in
(
select max(salary) from
(
select e.emp_no,max(salary) salary,e.last_name,e.first_name 
from employees e join salaries s on e.emp_no = s.emp_no
where salary not in
(
(select max(salary) from salaries)
)
group by e.emp_no
) r
)