获取薪水第二多的员工的empno以及其对应的薪水salary
获取当前薪水第二多的员工的emp_no以及其对应的薪水salary
https://www.nowcoder.com/practice/c1472daba75d4635b7f8540b837cc719
select emp_no,
salary,
last_name,
first_name
from employees
left join salaries using(emp_no)
where salary=(select max(salary) from salaries
where salary<(select max(salary) from salaries))
/*排除掉第一最大值，选第二最大值。*/
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