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  • LeetCode(数据库)部门最高工资

    Create table If Not Exists Employee (Id int, Name varchar(255), Salary int, DepartmentId int)
    Create table If Not Exists Department (Id int, Name varchar(255))
    Truncate table Employee
    insert into Employee (Id, Name, Salary, DepartmentId) values ('1', 'Joe', '70000', '1')
    insert into Employee (Id, Name, Salary, DepartmentId) values ('2', 'Henry', '80000', '2')
    insert into Employee (Id, Name, Salary, DepartmentId) values ('3', 'Sam', '60000', '2')
    insert into Employee (Id, Name, Salary, DepartmentId) values ('4', 'Max', '90000', '1')
    Truncate table Department
    insert into Department (Id, Name) values ('1', 'IT')
    insert into Department (Id, Name) values ('2', 'Sales')
    ---第一种
    SELECT D.Name AS Department ,E.Name AS Employee ,E.Salary 
    FROM
        Employee E,
        (SELECT DepartmentId,max(Salary) as max FROM Employee GROUP BY DepartmentId) T,
        Department D
    WHERE E.DepartmentId = T.DepartmentId 
      AND E.Salary = T.max
      AND E.DepartmentId = D.id
    --第二种
    SELECT D.Name,A.Name,A.Salary 
    FROM 
        Employee A,
        Department D   
    WHERE A.DepartmentId = D.Id 
      AND NOT EXISTS 
      (SELECT 1 FROM Employee B WHERE B.Salary > A.Salary AND A.DepartmentId = B.DepartmentId) 
    --第三种
    SELECT D.Name AS Department ,E.Name AS Employee ,E.Salary 
    from 
        Employee E,
        Department D 
    WHERE E.DepartmentId = D.id 
      AND (DepartmentId,Salary) in 
      (SELECT DepartmentId,max(Salary) as max FROM Employee GROUP BY DepartmentId)
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  • 原文地址:https://www.cnblogs.com/lxl57610/p/8674828.html
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