Unable to count left and right in binary tree

5 pts.
Tags:
Binary tree
Hi all,
I'm unable to count left and right member.
My table looks like this:
————————————————————-
| id | parent id | placement type |
————————————————————-
| 1 | 0 | – |
| 2 | 1 | L |
| 3 | 1 | R |
| 4 | 2 | L |
| 5 | 2 | R |
| 6 | 3 | L |
| 7 | 3 | R |
————————————————————-
I just want to count how much members are in left and right in 1st binary tree.
binary tree—
       1
      /
     2   3
    / /
    4 5 6 7
Please help!

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