3288
MariaDBERRORNotableCTEsHIGH confidence
Recursive CTE recursive member cannot use aggregation
Production Risk
Low — query is rejected.
How to reproduce
trigger — this will error
trigger — this will error
WITH RECURSIVE cte AS (SELECT 1 AS n UNION ALL SELECT COUNT(*) FROM cte WHERE n < 10) SELECT * FROM cte;
expected output
ERROR 3288 (HY000): Recursive CTE 'cte' cannot contain aggregation in recursive query block.
Fix
Remove aggregation from recursive part
Remove aggregation from recursive part
WITH RECURSIVE cte AS (SELECT 1 AS n UNION ALL SELECT n+1 FROM cte WHERE n < 10) SELECT COUNT(*) FROM cte;
Why this works
Aggregate the final result set in the outer query, not inside the recursive member.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3288 ER_CTE_RECURSIVE_FORBIDS_AGGREGATION
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