获取当前薪水第二多的员工emp_no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 a.emp_no,b.salary,a.last_name,a.first_name from employees a join salaries b on a.emp_no = b.emp_no where salary = ( select max(salary) from salaries where salary <> (select max(salary) from salaries) )
