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How do recursive CTEs work?

Mid PostgreSQL
Quick Answer Recursive CTEs traverse hierarchical or graph-like data. Structure: WITH RECURSIVE cte AS (base_case UNION ALL recursive_case WHERE termination_condition). Base case: initial rows (root nodes). Recursive case: references the CTE to get next level. Use for: org charts (employee hierarchy), category trees, graph traversal, bill of materials. Add a depth counter or LIMIT to prevent infinite recursion.

Answer

Recursive CTEs contain an anchor part and a recursive part that repeats until no new rows are returned.
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