Binary Tree Nodes | HackerRank SQL Problem (English)

Problem Name: Binary Tree Nodes
Difficulty Level: Medium

Key topics here:
- CTE (Common Table Expression)
- Aggregate Function
- Group By

✴️ To learn about CTE, check this videos:
✴️ To learn about Aggregate and Group By check this video:

Timestamps
00:00 Problem Statement
02:09 Solution

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