3293
MariaDBERRORNotableCTEsHIGH confidence
Recursive CTE recursive member cannot use window functions
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 ROW_NUMBER() OVER () FROM cte WHERE n < 5) SELECT * FROM cte;
expected output
ERROR 3293 (HY000): Window functions are not allowed in recursive CTE query block.
Fix
Apply window function in outer query
Apply window function in outer query
WITH RECURSIVE cte AS (SELECT 1 AS n UNION ALL SELECT n+1 FROM cte WHERE n < 5) SELECT ROW_NUMBER() OVER (ORDER BY n) AS rn, n FROM cte;
Why this works
Window functions applied to the final result set work correctly.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3293 ER_CTE_RECURSIVE_FORBIDS_WINDOW_FUNCTIONS
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