Solve Binary Tree Nodes in SQL | HackerRank Advanced Select Challenge Explained

Struggling with SQL problems on HackerRank? In this tutorial, I walk you through the "Binary Tree Nodes" problem from the Advanced Select section of SQL on HackerRank.

✅ Learn how to:

Identify Root, Inner, and Leaf nodes in a Binary Tree using SQL

Use CASE WHEN, IN, and subqueries effectively

Sort and format your output as required by HackerRank

🎓 Perfect for beginners and intermediate SQL learners preparing for coding interviews or certifications.

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