LeetCode——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      |

+----------+

这种单表比较条件，一般都是表内进行join操作.

参照此思路，解题如下所示：

# Write your MySQL query statement below

SELECT

    a.Name AS Employee

FROM Employee a, Employee b

WHERE

    a.ManagerId = b.Id

    AND a.Salary > b.Salary;

运行效率在可以接受的范围，此外语句也较为清晰便于维护.

巴特西

LeetCode——Employees Earning More Than Their Managers

最新文章

热门文章