docs-v2/content/flux/v0.x/stdlib/universe/top.md

title	description	aliases	menu	weight	flux/v0.x/tags	introduced
top() function	The `top()` function sorts a table by columns and keeps only the top n records.	/influxdb/v2.0/reference/flux/functions/transformations/selectors/top /influxdb/v2.0/reference/flux/functions/built-in/transformations/selectors/top/ /influxdb/v2.0/reference/flux/stdlib/built-in/transformations/selectors/top/ /influxdb/cloud/reference/flux/stdlib/built-in/transformations/selectors/top/	flux_0_x_ref name parent top universe	102	selectors transformations	0.7.0

The top() function sorts each input table by columns and keeps only the top n records. top() is a selector function.

top(n:10, columns: ["_value"])

{{% warn %}}

Empty tables

top() drops empty tables. {{% /warn %}}

Parameters

n

({{< req >}}) Number of records to return.

columns

List of columns to sort by. Sort precedence is determined by list order (left to right). Default is ["_value"].

tables

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

Examples

{{% flux/sample-example-intro %}}

Return rows with the top three values in each input table

import "sampledata"

sampledata.int()
    |> top(n: 3)

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

Input data

{{% flux/sample "float" %}}

{{% /flex-content %}} {{% flex-content %}}

Output data

_time	tag	_value
2021-01-01T00:00:30Z	t1	17
2021-01-01T00:00:40Z	t1	15
2021-01-01T00:00:10Z	t1	10

_time	tag	_value
2021-01-01T00:00:00Z	t2	19
2021-01-01T00:00:30Z	t2	19
2021-01-01T00:00:40Z	t2	13
{{% /flex-content %}}
{{< /flex >}}
{{% /expand %}}
{{< /expand-wrapper >}}