> 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-1900-to-1999/e1901.md).

# Error 1901: Function or expression cannot be used in the clause of

| Error Code | SQLSTATE | Error                                             | Description                                                         |
| ---------- | -------- | ------------------------------------------------- | ------------------------------------------------------------------- |
| 1901       |          | ER\_GENERATED\_COLUMN\_FUNCTION\_IS\_NOT\_ALLOWED | Function or expression '%s' cannot be used in the %s clause of %\`s |

## Possible Causes and Solutions

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