3286
MariaDBERRORNotableCTEsHIGH confidence
Recursive CTE must use UNION
Production Risk
Low — query is rejected; add the required UNION ALL.
How to reproduce
trigger — this will error
trigger — this will error
WITH RECURSIVE cte AS (SELECT 1 AS n SELECT n+1 FROM cte WHERE n < 10) SELECT * FROM cte;
expected output
ERROR 3286 (HY000): Recursive Common Table Expression 'cte' should contain a UNION.
Fix
Add UNION ALL
Add UNION ALL
WITH RECURSIVE cte AS (SELECT 1 AS n UNION ALL SELECT n+1 FROM cte WHERE n < 10) SELECT * FROM cte;
Why this works
UNION ALL separates the anchor member from the recursive member.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3286 ER_CTE_RECURSIVE_REQUIRES_UNION
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