是否有任何方法可以通过其父id得到左和右子级的总数，直到子级的“N”个。
这是我的用户表，我在其中存储带有腿（左/右）位置的父子信息
其中:
1. referral_id : is the id of parent user of child user
2. left_child_id : is the id of child user who joined the user on left leg
3. right_child_id : is the id of child user who joined the user on right leg.
4. position_to_referral : is the position name(left/right leg) where he joined the parent user
欢迎任何帮助或任何形式的建议。
嵌套集模型不是更有意义吗？
1 A 14
|
+-------+--------+
| |
2 B 7 8 C 13
| |
+---+---+ +----+----+
| | | |
3 D 4 5 E 6 9 F 10 11 G 12
user lft rgt
A 1 14
B 2 7
C 8 13
D 3 4
E 5 6
F 9 10
G 11 12
