181.Employee Earning More Than Their Managers
181.Employees Earning More Than Their Managers
难度:Easy
SQL架构 Employee 表包含所有员工,他们的经理也属于员工。每个员工都有一个 Id,此外还有一列对应员工的经理的 Id。
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+----+-------+--------+-----------+
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| Id | Name | Salary | ManagerId |
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+----+-------+--------+-----------+
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| 1 | Joe | 70000 | 3 |
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| 2 | Henry | 80000 | 4 |
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| 3 | Sam | 60000 | NULL |
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| 4 | Max | 90000 | NULL |
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+----+-------+--------+-----------+
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给定 Employee 表,编写一个 SQL 查询,该查询可以获取收入超过他们经理的员工的姓名。在上面的表格中,Joe 是唯一一个收入超过他的经理的员工。
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+----------+
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| Employee |
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+----------+
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| Joe |
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+----------+
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代码如下:
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SELECT a.Name as Employee FROM Employee as a, Employee as b WHERE a.ManagerId=b.Id AND a.Salary>b.Salary;
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