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题目:
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 |
+----------+
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 ande.salary>m.salary;
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