Database LeetCode Employees Earning More Than Their Managers
2016-02-17 20:33
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题目:
The
Given the
employee who earns more than his manager.
+----------+
| Employee |
+----------+
| Joe |
+----------+
题意:
给定上述的一个数据表,要求写一个SQL的查询语句,找出那些赚得比他们的经理工资要多的员工的姓名。
题解:
此题考虑用连接来做。可以将一张表格考虑成两张表格来做,然后用内连接的不等值连接来取得相应的结果;这里有一个需要注意的地方:在输出的时候,需要将姓名的列名改为Employee。
还有一种是用自连接来做:
select e.name as 'Employee'
from Employee e,Employee m
where e.managerid=m.id
and
e.salary>m.salary;
The
Employeetable 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
Employeetable, 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 |
+----------+
题意:
给定上述的一个数据表,要求写一个SQL的查询语句,找出那些赚得比他们的经理工资要多的员工的姓名。
题解:
此题考虑用连接来做。可以将一张表格考虑成两张表格来做,然后用内连接的不等值连接来取得相应的结果;这里有一个需要注意的地方:在输出的时候,需要将姓名的列名改为Employee。
select e.Name as Employee from Employee as e join Employee as x on e.ManagerId = x.Id and e.Salary >= x.Salary;
还有一种是用自连接来做:
select e.name as 'Employee'
from Employee e,Employee m
where e.managerid=m.id
and
e.salary>m.salary;
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