sql - 在 SQL 中查找每个部门员工的最高薪水

Question

结果应该是下图中的下划线行

Answer 1

您可以使用相关子查询

select * from tablename t1 where salary = 
(select max(salary) from tablename t2 where t1.deptname=t2.deptname)

Answer 2

如果支持您的 dbms，请使用窗口功能

select * from 
(
select *, row_number() over(partition by department order sal desc) rn
from your_tab
) t where t.rn=1

Answer 3

select sal.empid,sal.name,t.department,t.sal from salary ,(select department,MAX(sal) as sal from salary group by dep)t
where  sal.dep=t.dep and sal.sal=t.sal