זה לא צריך להיות מסובך מדי, לדוגמה:
קוד:
Table:
Employees
Columns:
id (INT A_I PK) | name (VARCHAR) | role (ENUM admin\leader\user) | leader_id (INT) | ..
Rows:
1 | admin | admin | 0 | ..
2 | leader1 | leader | 0 | ..
3 | leader2 | leader | 0 | ..
4 | user1 | user | 2 | ..
5 | user2 | user | 2 | ..
6 | user3 | user | 3 | ..
7 | user4 | user | 3 | ..