> ## Documentation Index
> Fetch the complete documentation index at: https://www.integrate.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ETL: CONCAT

> Join a variable number of string expressions into one combined string. Use CONCAT for building composite fields in Integrate.io ETL pipelines.

## Description

Concatenates a variable number of strings and returns them as one string.

## Syntax

`CONCAT(string_expression1, string_expression2[`…, string\_expressionN])

## Examples

`CONCAT('username','@xyzmail.com')` returns '[username@xyzmail.com](mailto:username@xyzmail.com)'

## Return value datatype

String

## Impact of null value

If input is null, returns null.