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。
+----+-------+--------+-----------+| Id | Name | Salary | ManagerId | +----+-------+--------+-----------+ | 1 | Joe | 70000 | 3 || 2 | Henry | 80000 | 4 | | 3 | Sam | 60000 | NULL || 4 | Max | 90000 | NULL | +----+-------+--------+-----------+
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。
+----------+| Employee |+----------+| Joe |+----------+
Solution:
SELECT a. NAME AS employee FROM employee a, employee b WHERE a.managerId = b.idAND a.salary > b.salary;
作者:lconcise
链接:https://www.jianshu.com/p/9a1cfed4f7c3