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hardDSA

Recursive CTE with cycle detection — how do you handle circular manager references and produce a search order?

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01

Understand the problem

Use path array or PG 14+ CYCLE / SEARCH clauses to prevent infinite recursion and order hierarchically.

recursive-ctecycle-detectionpostgres
02

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03

Study the solution

Track a path array and filter WHERE id <> ALL(path) or use Postgres 14+ CYCLE + SEARCH clauses. SEARCH BREADTH FIRST gives level-order; DEPTH FIRST gives pre-order traversal.

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