Employees Earning More Than Their Managers

最新推荐文章于 2021-12-10 22:08:35 发布

原创最新推荐文章于 2021-12-10 22:08:35 发布 · 2.3k 阅读

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本文介绍了一种SQL查询的方法，用于找出薪资比他们的直接上级更高的员工。通过使用自连接和内连接两种方式，可以有效地从包含员工及其上级信息的数据表中筛选出符合条件的记录。

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    The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.

    +----+-------+--------+-----------+
    | Id | Name  | Salary | ManagerId |
    +----+-------+--------+-----------+
    | 1  | Joe   | 70000  | 3         |
    | 2  | Henry | 80000  | 4         |
    | 3  | Sam   | 60000  | NULL      |
    | 4  | Max   | 90000  | NULL      |
    +----+-------+--------+-----------+
    Given the Employee table, write a SQL query that finds out employees who earn more than their managers. For the above table, Joe is the only employee who earns more than his manager.

    +----------+
    | Employee |
    +----------+
    | Joe      |
    +----------+

    自连接
        select e.name as 'Employee' 
            from Employee e,Employee m 
                where e.managerid=m.id 
                    and 
                       e.salary>m.salary;
    内连接
        select e.name as Employee 
            from employee e inner join employee m 
                on e.managerid=m.id and e.salary>m.salary;