Hierarchies (org charts, bill-of-materials, category trees) need recursion, and a self-join only goes one level deep. The signal is the recursive CTE with its anchor plus recursive members, and knowing how it terminates.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
Hierarchies (org charts, bill-of-materials, category trees) need recursion, and a self-join only goes one level deep. The signal is the recursive CTE with its anchor plus recursive members, and knowing how it terminates.
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