select 部门编号,max(工资) from EMP group by 部门,试一试行不行……
SELECT 部门编号 FROM EMP WHERE 工资 IN (SELECT MAX(工资) FROM EMP)
select 部门编号,max(工资) from EMP
SELECT 部门编号FROM EMPWHERE NOT EXISTS ( SELECT 1 FROM EMP t WHERE EMP.工资 < t.工资 )