题解 | 错了很多次
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 e.emp_no 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 where to_date = '9999-01-01' ) and to_date = '9999-01-01' ) and to_date = '9999-01-01'
SQL运算逻辑从里到外,表头字段名唯一可不用加表名前缀