---
title: ES|QL MV_APPEND function
description: 
url: https://www.elastic.co/elastic/docs-builder/docs/3729/reference/query-languages/esql/functions-operators/mv-functions/mv_append
products:
  - Elasticsearch
---

# ES|QL MV_APPEND function
<applies-to>
  - Elastic Cloud Serverless: Generally available
  - Elastic Stack: Generally available
</applies-to>

Appends two multi-value fields together.

## Syntax

![Embedded](https://www.elastic.co/elastic/docs-builder/docs/3729/reference/query-languages/esql/images/generated/x-pack-esql/functions/mv_append.svg)


## Parameters

<definitions>
  <definition term="field1">
  </definition>
  <definition term="field2">
  </definition>
</definitions>


## Description

Concatenates values of two multi-value fields.

## Supported types


| field1                                                              | field2                                                              | result          |
|---------------------------------------------------------------------|---------------------------------------------------------------------|-----------------|
| boolean                                                             | boolean                                                             | boolean         |
| cartesian_point                                                     | cartesian_point                                                     | cartesian_point |
| cartesian_shape                                                     | cartesian_shape                                                     | cartesian_shape |
| date                                                                | date                                                                | date            |
| date_nanos                                                          | date_nanos                                                          | date_nanos      |
| double                                                              | double                                                              | double          |
| flattened <applies-to>Elastic Stack: Preview since 9.5</applies-to> | flattened <applies-to>Elastic Stack: Preview since 9.5</applies-to> | flattened       |
| geo_point                                                           | geo_point                                                           | geo_point       |
| geo_shape                                                           | geo_shape                                                           | geo_shape       |
| geohash                                                             | geohash                                                             | geohash         |
| geohex                                                              | geohex                                                              | geohex          |
| geotile                                                             | geotile                                                             | geotile         |
| integer                                                             | integer                                                             | integer         |
| ip                                                                  | ip                                                                  | ip              |
| keyword                                                             | keyword                                                             | keyword         |
| keyword                                                             | text                                                                | keyword         |
| long                                                                | long                                                                | long            |
| text                                                                | keyword                                                             | keyword         |
| text                                                                | text                                                                | keyword         |
| unsigned_long                                                       | unsigned_long                                                       | unsigned_long   |
| version                                                             | version                                                             | version         |


## Example

```esql
FROM employees
| WHERE emp_no == 10039 OR emp_no == 10040
| SORT emp_no
| EVAL dates = MV_APPEND(birth_date, hire_date)
| KEEP emp_no, birth_date, hire_date, dates
```


| emp_no:integer | birth_date:date      | hire_date:date       | dates:date                                   |
|----------------|----------------------|----------------------|----------------------------------------------|
| 10039          | 1959-10-01T00:00:00Z | 1988-01-19T00:00:00Z | [1959-10-01T00:00:00Z, 1988-01-19T00:00:00Z] |
| 10040          | null                 | 1993-02-14T00:00:00Z | null                                         |