题解 | #获取每个部门中当前员工薪水最高的相关信息#

select dept_no, sa.emp_no, salary
from dept_emp de join salaries sa on de.emp_no = sa.emp_no
where sa.to_date = '9999-01-01' 
and (dept_no,salary) in(
    select dept_no,max(salary) from dept_emp de join salaries sa on de.emp_no = sa.emp_no
    group by dept_no
)
order by dept_no

新思路，查找速度提升20%