LeetCode 184. Department Highest Salary（找出每个部门中最高薪水）

第一种情况：普通情况 第二种情况：   第三种情况：     结果： select t1.Name as Employee,t1.Salary as Salary,t2.Name as Department from Employee t1 left join Department t2 on t1.DepartmentId=t2.Id where (t1.DepartmentId,t1.Sala

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