Problem
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 |
+----------+
Solution 1
# Write your MySQL query statement below
select
a.Name as Employee
from Employee a
left join Employee b
on a.ManagerId = b.Id
where a.Salary > b.Salary
Explain:
nope.
Complexity:
- Time complexity :
- Space complexity :
Solution 2
# 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
Explain:
nope.
Complexity:
- Time complexity :
- Space complexity :