Use path array or PG 14+ CYCLE / SEARCH clauses to prevent infinite recursion and order hierarchically.
Skip to solutionKEEP THE
hardDSA
Recursive CTE with cycle detection — how do you handle circular manager references and produce a search order?
402 views
01
Understand the problem
recursive-ctecycle-detectionpostgres
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
Nudge consolestandby
Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.
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.
Solution ready — 2 min read
Classified // press E to declassify
04
Join the discussion
Discussion (0)
Sign in to join the discussion.
No responses yet. Be the first to share what you think.
Transmission complete // awaiting log
KEEP THE
STREAK ALIVE.
Dossier 66 of 70 decoded in the SQL track. One more won't hurt.