20170312LeetcodeMysql练习01
181. 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 | +----------+
My solution:
01. SELECT e1.Name AS Employee FROM Employee e1, Employee e2 WHERE e1.ManagerId = e2.ID AND e1.Salary > e2.Salary 02. SELECT e1.Name AS Employee FROM Employee e1 JOIN Employee e2 ON e1.ManagerId = e2.Id WHERE e1.Salary > e2.Salary