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
            A.emp_no,
            B.salary,
            A.last_name,
            A.first_name
        from
            employees A
            left join salaries B on A.emp_no = B.emp_no
        where
            salary != (
                select
                    max(salary)
                from
                    salaries
            )
    ) as C
where
    salary = (
        select
            max(salary)
        from
            (
                select
                    A.emp_no,
                    B.salary,
                    A.last_name,
                    A.first_name
                from
                    employees A
                    left join salaries B on A.emp_no = B.emp_no
                where
                    salary != (
                        select
                            max(salary)
                        from
                            salaries
                    )
            ) as C
    )