---
title: set() function
description: set() assigns a static column value to each row in the input tables.
url: https://docs.influxdata.com/flux/v0/stdlib/universe/set/
estimated_tokens: 1332
product: Flux
version: v0
---

# set() function

-   Flux 0.7.0+
-   View InfluxDB support

`set()` assigns a static column value to each row in the input tables.

`set()` may modify an existing column or add a new column. If the modified column is part of the group key, output tables are regrouped as needed. `set()` can only set string values.

##### Function type signature

```js
(<-tables: stream[A], key: string, value: string) => stream[A] where A: Record
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### key

(Required) Label of the column to modify or set.

### value

(Required) String value to set.

### tables

Input data. Default is piped-forward data (`<-`).

## Examples

### Set a column to a specific string value

```js
import "sampledata"

sampledata.int()
    |> set(key: "host", value: "prod1")
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | -2 | t1 |
| 2021-01-01T00:00:10Z | 10 | t1 |
| 2021-01-01T00:00:20Z | 7 | t1 |
| 2021-01-01T00:00:30Z | 17 | t1 |
| 2021-01-01T00:00:40Z | 15 | t1 |
| 2021-01-01T00:00:50Z | 4 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 19 | t2 |
| 2021-01-01T00:00:10Z | 4 | t2 |
| 2021-01-01T00:00:20Z | -3 | t2 |
| 2021-01-01T00:00:30Z | 19 | t2 |
| 2021-01-01T00:00:40Z | 13 | t2 |
| 2021-01-01T00:00:50Z | 1 | t2 |

#### Output data

| _time | _value | *tag | host |
| --- | --- | --- | --- |
| 2021-01-01T00:00:00Z | -2 | t1 | prod1 |
| 2021-01-01T00:00:10Z | 10 | t1 | prod1 |
| 2021-01-01T00:00:20Z | 7 | t1 | prod1 |
| 2021-01-01T00:00:30Z | 17 | t1 | prod1 |
| 2021-01-01T00:00:40Z | 15 | t1 | prod1 |
| 2021-01-01T00:00:50Z | 4 | t1 | prod1 |

| _time | _value | *tag | host |
| --- | --- | --- | --- |
| 2021-01-01T00:00:00Z | 19 | t2 | prod1 |
| 2021-01-01T00:00:10Z | 4 | t2 | prod1 |
| 2021-01-01T00:00:20Z | -3 | t2 | prod1 |
| 2021-01-01T00:00:30Z | 19 | t2 | prod1 |
| 2021-01-01T00:00:40Z | 13 | t2 | prod1 |
| 2021-01-01T00:00:50Z | 1 | t2 | prod1 |

[transformations](/flux/v0/tags/transformations/)