docs-v2/content/v2.0/reference/flux/functions/built-in/transformations/group.md

title	description	aliases	menu	weight
group() function	The `group()` function groups records based on their values for specific columns.	/v2.0/reference/flux/functions/transformations/group	v2_0_ref name parent group built-in-transformations	401

The group() function groups records based on their values for specific columns. It produces tables with new group keys based on provided properties. Specify an empty array of columns to ungroup data or merge all input tables into a single output table.

Function type: Transformation

group(columns: ["host", "_measurement"], mode:"by")

// OR

group(columns: ["_time"], mode:"except")

// OR

group()

Parameters

columns

List of columns to use in the grouping operation. Defaults to [].

Data type: Array of strings

mode

The mode used to group columns.

Data type: String

The following options are available:

• by
• except

Defaults to "by".

by

Groups records by columns defined in the columns parameter.

except

Groups records by all columns except those defined in the columns parameter.

Examples

Group by host and measurement

from(bucket: "telegraf/autogen")
  |> range(start: -30m)
  |> group(columns: ["host", "_measurement"])

Group by everything except time

from(bucket: "telegraf/autogen")
  |> range(start: -30m)
  |> group(columns: ["_time"], mode: "except")

Ungroup data

// Merge all tables into a single table
from(bucket: "telegraf/autogen")
  |> range(start: -30m)
  |> group()

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Related InfluxQL functions and statements:

GROUP BY (similar but different)