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

# ES|QL MV_DEDUPE function
## Syntax

![Embedded](https://www.elastic.co/docs/reference/query-languages/esql/images/functions/mv_dedupe.svg)


## Parameters

<definitions>
  <definition term="field">
    Expression that can be null, a single value, or multiple values.
  </definition>
</definitions>


## Description

Remove duplicate values from a multivalued field.
<note>
  `MV_DEDUPE` may, but won’t always, sort the values in the column.
</note>


## Supported types


| field           | result          |
|-----------------|-----------------|
| boolean         | boolean         |
| cartesian_point | cartesian_point |
| cartesian_shape | cartesian_shape |
| date            | date            |
| date_nanos      | date_nanos      |
| double          | double          |
| geo_point       | geo_point       |
| geo_shape       | geo_shape       |
| geohash         | geohash         |
| geohex          | geohex          |
| geotile         | geotile         |
| integer         | integer         |
| ip              | ip              |
| keyword         | keyword         |
| long            | long            |
| text            | keyword         |
| unsigned_long   | unsigned_long   |
| version         | version         |


## Example

```esql
ROW a=["foo", "foo", "bar", "foo"]
| EVAL dedupe_a = MV_DEDUPE(a)
```


| a:keyword                    | dedupe_a:keyword |
|------------------------------|------------------|
| ["foo", "foo", "bar", "foo"] | ["foo", "bar"]   |