[LeetCode]-DataBase-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 |
+----------+ 要求:查询出表中工资比经理高的员工姓名 查询一:
CREATE TABLE `employee` (
`id` tinyint(3) unsigned DEFAULT NULL,
`e_name` varchar(20) DEFAULT NULL,
`salary` decimal(10,2) DEFAULT NULL,
`m_id` tinyint(3) unsigned DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
SELECT em1.e_name
FROM(SELECT id,e_name,salary,m_id FROM employee_1 WHERE m_id IS NOT NULL) em1
INNER JOIN employee_1 em2 ON em1.m_id=em2.id
WHERE em1.salary>em2.salary
查询二:
SELECT e1.e_name
FROM employee_1 e1
INNER JOIN employee_1 e2 ON e1.m_id=e2.id
WHERE e1.salary>e2.salary
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