Error
Error Code:
3576
MySQL Error 3576: Recursive CTE Join Order Violation
Description
This error occurs within a Recursive Common Table Expression (CTE) when the recursive part of the query violates specific join rules. It typically indicates an invalid placement of the recursive table in a `LEFT JOIN` or an explicit join order hint preventing proper recursion. MySQL enforces these restrictions to ensure correct and predictable recursive query execution.
Error Message
In recursive query block of Recursive Common Table Expression '%s', the recursive table must neither be in the right argument of a LEFT JOIN, nor be forced to be non-first with join order hints
Known Causes
3 known causesRecursive Table in LEFT JOIN
The recursive table, which refers to the CTE itself, is placed in the right-hand argument of a `LEFT JOIN` within the recursive query block. This configuration can lead to ambiguous or incorrect recursive results.
Explicit Join Order Hint
SQL join order hints (e.g., `STRAIGHT_JOIN`) or optimizer settings are used to force the recursive table to be processed in a non-initial position within the join sequence of the recursive query block.
Misunderstanding Recursive CTE Rules
Improper understanding of MySQL's specific rules for recursive CTEs, particularly how the recursive table must interact with other tables and joins, leads to invalid query structures.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service