refactor 570

Author: fishercoder1534

Diff for: database/_570.sql

@@ -1,26 +1,3 @@
---570. Managers with at Least 5 Direct Reports
---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.
-
 select Name from Employee as Name where Id in
     (select ManagerId from Employee group by ManagerId having count(*) >= 5)
 ;