> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/error-codes/mariadb-error-codes-1800-to-1899/e1822.md).

# Error 1822: Failed to add the foreign key constraint. Missing index for constraint in the referenced

| Error Code | SQLSTATE | Error                     | Description                                                                                              |
| ---------- | -------- | ------------------------- | -------------------------------------------------------------------------------------------------------- |
| 1822       | HY000    | ER\_FK\_NO\_INDEX\_PARENT | Failed to add the foreign key constraint. Missing index for constraint '%s' in the referenced table '%s' |

## Possible Causes and Solutions

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