Does any body know how to create binary tree in sql

Question

I am creating MLM website and now I want to build binary tree.. So that user enter their private id and select the sponsor id.

The binary tree should work as follows :

1 is root
2 is child of 1
3 is child of 1

Then 4 is child of 2
5 is child of 2

6 is child of 3
7 is child of 3

Thank you.

Answer 1

maintain left_child , right_child , and sponser_id in each row (record of a member)

| ID         |   Name      | left_child  | right_child  | sponser_id |
|:-----------|------------:|:-----------:|:------------:|:----------:|
| 1          |   Root      |     2       |      2       |            |
| 2          |   child-2   |     4       |      5       |     1      |
| 3          |   child-3   |     6       |      7       |     1      |
| 4          |   child-4   |     x       |      y       |     2      |
| 5          |   child-5   |     a       |      b       |     2      |