题解 | #获取当前薪水第二多的员工的emp_no

# 不使用order by查询第二高工资，则要查询两次最高工资
# 子表--查询第二高工资
select max(salary) 
from salaries
where salary < (select max(salary) from salaries)

# 查询第二高工资的员工信息
select e.emp_no, salary, last_name, first_name
from employees e
join salaries s
on e.emp_no=s.emp_no
where salary = (
    select max(salary) 
    from salaries
    where salary < (select max(salary) from salaries)
);