> 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/e1291.md).

# Error 1291: Column has duplicated value

| Error Code | SQLSTATE | Error                           | Description                                 |
| ---------- | -------- | ------------------------------- | ------------------------------------------- |
| 1291       | HY000    | ER\_DUPLICATED\_VALUE\_IN\_TYPE | Column '%s' has duplicated value '%s' in %s |

## Possible Causes and Solutions

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