Decide Your Recursive CTE Path Before a Hierarchy Loops Forever
Choose the correct design path for recursive CTEs, including cycle detection and testing strategy.
The failure mode One bad manager relationship turns a harmless org-chart query into a hanging page load. Recursive SQL needs a stopping story, not just a traversal story. Framework Anchor → Recurse → Guard Recursive SQL is safest when you can point to the seed rows, the advancing edge, and the cycle rule separately. Start with the correct anchor rows, advance with one clear recursive join, and guard against repeats with an explicit path or PostgreSQL’s CYCLE clause. Use LIMIT only as a testing aid while validating shape. Common trap Assume the data is a perfect tree and skip cycle…
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