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Recursive CTE in SQL made simple.

A recursive CTE helps you build hierarchy data level by level.

Perfect for examples like:

Employee → Manager structure
Category → Subcategory trees
Folder → Subfolder paths
Parent → Child relationships

The key idea:

Anchor query starts the hierarchy.
Recursive query finds the next level.
UNION ALL connects both parts.
Level increases step by step.

Save this if SQL hierarchies usually feel confusing.

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