---
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: 881
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/universe/set/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.7.0+

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/)
| _time | _value | *tag |
| --- | --- | --- |
| _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 |
| --- | --- | --- |
| _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 |

| _time | _value | *tag | host |
| --- | --- | --- | --- |
| _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 |
| --- | --- | --- | --- |
| _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 |