Employees Earning More Than Their Managers
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;
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