Lukas Eder • 3/24/2023

How to Turn a List of Flat Elements into a Hierarchy in Java, SQL, or jOOQ

This technical article explains methods for transforming flat database records (like a file directory) into a hierarchical tree structure. It compares a complex recursive SQL query in PostgreSQL with a simpler, modern approach using the jOOQ 3.19 library's `intoHierarchy` collector in Java, providing code examples for both.

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#sql #postgresql #Jooq