> 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/sql-functions/special-functions/dynamic-columns-functions/column_exists.md).

# COLUMN\_EXISTS

## Syntax

```bnf
COLUMN_EXISTS(dyncol_blob, column_nr)
COLUMN_EXISTS(dyncol_blob, column_name)
```

## Description

Checks if a column with name `column_name` exists in `dyncol_blob`. If yes, return `1`, otherwise return `0`. See [dynamic columns](/docs/server/reference/sql-structure/nosql/dynamic-columns.md) for more information.

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