---
title: tickscript.groupBy() function
description: >
  `tickscript.groupBy()` groups results by the `_measurement` column and other specified columns.
menu:
  flux_v0_ref:
    name: tickscript.groupBy
    parent: contrib/bonitoo-io/tickscript
    identifier: contrib/bonitoo-io/tickscript/groupBy
weight: 301
flux/v0/tags: [transformations]
---

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------------------------------------------------------------------------------->

`tickscript.groupBy()` groups results by the `_measurement` column and other specified columns.

This function is comparable to [Kapacitor QueryNode .groupBy](/kapacitor/latest/nodes/query_node/#groupby).

**Note**: To group by time intervals, use `window()` or `tickscript.selectWindow()`.

##### Function type signature

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

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

## Parameters

### columns
({{< req >}})
List of columns to group by.



### tables

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




## Examples

### Group by host and region

```js
import "contrib/bonitoo-io/tickscript"

data
    |> tickscript.groupBy(columns: ["host", "region"])

```

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{{% expand "View example input and output" %}}

#### Input data

| _time                | _measurement  | host  | region  | _field  | _value  |
| -------------------- | ------------- | ----- | ------- | ------- | ------- |
| 2021-01-01T00:00:00Z | m             | h1    | east    | foo     | 1.2     |
| 2021-01-01T00:01:00Z | m             | h1    | east    | foo     | 3.4     |
| 2021-01-01T00:00:00Z | m             | h2    | east    | foo     | 2.3     |
| 2021-01-01T00:01:00Z | m             | h2    | east    | foo     | 5.6     |
| 2021-01-01T00:00:00Z | m             | h3    | west    | foo     | 1.2     |
| 2021-01-01T00:01:00Z | m             | h3    | west    | foo     | 3.4     |
| 2021-01-01T00:00:00Z | m             | h4    | west    | foo     | 2.3     |
| 2021-01-01T00:01:00Z | m             | h4    | west    | foo     | 5.6     |


#### Output data

| _time                | *_measurement | *host | *region | _field  | _value  |
| -------------------- | ------------- | ----- | ------- | ------- | ------- |
| 2021-01-01T00:00:00Z | m             | h1    | east    | foo     | 1.2     |
| 2021-01-01T00:01:00Z | m             | h1    | east    | foo     | 3.4     |

| _time                | *_measurement | *host | *region | _field  | _value  |
| -------------------- | ------------- | ----- | ------- | ------- | ------- |
| 2021-01-01T00:00:00Z | m             | h2    | east    | foo     | 2.3     |
| 2021-01-01T00:01:00Z | m             | h2    | east    | foo     | 5.6     |

| _time                | *_measurement | *host | *region | _field  | _value  |
| -------------------- | ------------- | ----- | ------- | ------- | ------- |
| 2021-01-01T00:00:00Z | m             | h3    | west    | foo     | 1.2     |
| 2021-01-01T00:01:00Z | m             | h3    | west    | foo     | 3.4     |

| _time                | *_measurement | *host | *region | _field  | _value  |
| -------------------- | ------------- | ----- | ------- | ------- | ------- |
| 2021-01-01T00:00:00Z | m             | h4    | west    | foo     | 2.3     |
| 2021-01-01T00:01:00Z | m             | h4    | west    | foo     | 5.6     |

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