> 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-1200-to-1299/e1215.md).

# Error 1215: Cannot add foreign key constraint

| Error Code | SQLSTATE | Error                    | Description                       |
| ---------- | -------- | ------------------------ | --------------------------------- |
| 1215       | HY000    | ER\_CANNOT\_ADD\_FOREIGN | Cannot add foreign key constraint |

## Possible Causes and Solutions

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