> 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/e1830.md).

# Error 1830: Column cannot be NOT NULL: needed in a foreign key constraint SET NULL

| Error Code | SQLSTATE | Error                     | Description                                                                      |
| ---------- | -------- | ------------------------- | -------------------------------------------------------------------------------- |
| 1830       | HY000    | ER\_FK\_COLUMN\_NOT\_NULL | Column '%s' cannot be NOT NULL: needed in a foreign key constraint '%s' SET NULL |

## Possible Causes and Solutions

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