# Concatenate columns[¶](https://doc.dataiku.com/dss/latest/preparation/processors/columns-concat.html#concatenate-columns "Permalink to this headline")

Concatenate values across columns using a delimiter string and produce a single output.

## Example[¶](https://doc.dataiku.com/dss/latest/preparation/processors/columns-concat.html#example "Permalink to this headline")

If `col1=myval`, `col2=myother`, and the delimiter is `.` , the concatenated output is `myval.myother`.

## Options[¶](https://doc.dataiku.com/dss/latest/preparation/processors/columns-concat.html#options "Permalink to this headline")

**Columns to concatenate**

List the columns to concatenate.

**Delimiter to use**

The delimiter separates values from each input column within the output.

**Output column**

Column containing the concatenated values.
