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 s.emp_no, s.salary, e.last_name, e.first_name from employees e join salaries s on e.emp_no=s.emp_no where s.salary in(select max(salary) from salaries where salary not in (select max(salary) from salaries))
方法比较粗暴,有一点缺陷就是无法有多个对象
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