Nested sets trees (youtube code)

The graph in the videos:

stateDiagram-v2
    1/14 --> 2/9
    1/14 --> 10/13
    2/9 --> 3/4
    2/9 --> 5/6
    2/9 --> 7/8
    10/13 --> 11/12

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• Starting video
• 🐉 Nested sets trees 🐉 Playlist
• 🐾 Adjacency List Model in SQL 🐾 Playlist
• 🔱 Graphs & trees 🔱 playlist
• PostgreSQL code
• https://github.com/Rowadz/adjacency-list-model-in-sql