题解 | where创建表p,p中剔除max,继续在p表中保留max,即第二max

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 (select salary from employees e join salaries s on e.emp_no=s.emp_no where salary!=(select max(salary) from salaries)) p)

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