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