---
title: experimental.unpivot() function
description: >
  `experimental.unpivot()` creates `_field` and `_value` columns pairs using all columns (other than `_time`)
  _not_ in the group key.
  The `_field` column contains the original column label and the `_value` column
  contains the original column value.
menu:
  flux_v0_ref:
    name: experimental.unpivot
    parent: experimental
    identifier: experimental/unpivot
weight: 101
flux/v0/tags: [transformations]
introduced: 0.172.0
---

<!------------------------------------------------------------------------------

IMPORTANT: This page was generated from comments in the Flux source code. Any
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To make updates to this documentation, update the function comments above the
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------------------------------------------------------------------------------->

`experimental.unpivot()` creates `_field` and `_value` columns pairs using all columns (other than `_time`)
_not_ in the group key.
The `_field` column contains the original column label and the `_value` column
contains the original column value.

The output stream retains the group key and all group key columns of the input stream.
`_field` is added to the output group key.

##### Function type signature

```js
(<-tables: stream[{A with _time: time}], ?otherColumns: [string]) => stream[{B with _value: C, _field: string}] where A: Record, B: Record
```

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

## Parameters

### tables

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



### otherColumns

List of column names that are not in the group key but are also not field columns. Default is `["_time"]`.




## Examples

### Unpivot data into _field and _value columns

```js
import "experimental"

data
    |> experimental.unpivot()

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | *location | temp  | hum  |
| -------------------- | --------- | ----- | ---- |
| 2022-01-01T00:00:00Z | Denver    | 10.2  | 81.5 |
| 2022-01-02T00:00:00Z | Denver    | 12.4  | 41.3 |

| _time                | *location | temp  | hum  |
| -------------------- | --------- | ----- | ---- |
| 2022-01-01T00:00:00Z | New York  | 50.1  | 99.2 |
| 2022-01-02T00:00:00Z | New York  | 55.8  | 97.7 |


#### Output data

| *location | *_field | _time                | _value  |
| --------- | ------- | -------------------- | ------- |
| Denver    | hum     | 2022-01-01T00:00:00Z | 81.5    |
| Denver    | hum     | 2022-01-02T00:00:00Z | 41.3    |

| *location | *_field | _time                | _value  |
| --------- | ------- | -------------------- | ------- |
| New York  | hum     | 2022-01-01T00:00:00Z | 99.2    |
| New York  | hum     | 2022-01-02T00:00:00Z | 97.7    |

| *location | *_field | _time                | _value  |
| --------- | ------- | -------------------- | ------- |
| Denver    | temp    | 2022-01-01T00:00:00Z | 10.2    |
| Denver    | temp    | 2022-01-02T00:00:00Z | 12.4    |

| *location | *_field | _time                | _value  |
| --------- | ------- | -------------------- | ------- |
| New York  | temp    | 2022-01-01T00:00:00Z | 50.1    |
| New York  | temp    | 2022-01-02T00:00:00Z | 55.8    |

{{% /expand %}}
{{< /expand-wrapper >}}