MySQL error code
MySQL error 3909
MySQL server error 3909 is ER_WARN_FUNC_INDEX_NOT_APPLICABLE, reported with SQLSTATE HY000.
Cannot use functional index '%s' due to type or collation conversion.
| Error | 3909 |
|---|---|
| Name | ER_WARN_FUNC_INDEX_NOT_APPLICABLE |
| SQLSTATE | HY000 |
| Group | Server errors |
Source: MySQL 8.4 Error Reference