Managers with at Least 5 Direct Reports

Ninja
0/200
Average time to solve is 40m

Problem statement 

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      |Department |ManagerId |
+------+----------+-----------+----------+
|101   |John      |A          |null      |
|102   |Dan       |A          |101       |
|103   |James     |A          |101       |
|104   |Amy       |A          |101       |
|105   |Anne      |A          |101       |
|106   |Ron       |B          |101       |
+------+----------+-----------+----------+
Given the Employee table, write a SQL query that finds out managers with at least 5 direct report. For the above table, your SQL query should return:

+-------+
| Name  |
+-------+
| John  |
+-------+
Note:
No one would report to himself
Solution
(100% EXP penalty)
Managers with at Least 5 Direct Reports
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