Error
Error Code:
1260
MySQL Error 1260: GROUP_CONCAT Result Truncated
Description
This error occurs when the `GROUP_CONCAT()` function attempts to produce a string longer than the maximum allowed length, specified by the `group_concat_max_len` system variable. MySQL truncates the result, indicating that one or more rows were cut to fit within the limit.
Error Message
Row %u was cut by GROUP_CONCAT()
Known Causes
3 known causesInsufficient `group_concat_max_len`
The `group_concat_max_len` system variable is set to a value that is too small for the intended concatenated string.
Large Concatenated Data
The combined length of the strings being aggregated by `GROUP_CONCAT()` naturally exceeds the default or configured maximum length.
Excessive Rows in Group
A large number of individual rows within a `GROUP BY` clause contribute to a very long concatenated string, pushing it beyond the limit.
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