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

title	description	aliases	menu	weight	flux/v0.x/tags	related	introduced
first() function	The `first()` function selects the first non-null record from an input table.	/influxdb/v2.0/reference/flux/functions/transformations/selectors/first /influxdb/v2.0/reference/flux/functions/built-in/transformations/selectors/first/ /influxdb/v2.0/reference/flux/stdlib/built-in/transformations/selectors/first/ /influxdb/cloud/reference/flux/stdlib/built-in/transformations/selectors/first/	flux_0_x_ref name parent first universe	102	selectors transformations	/{{< latest "influxdb" >}}/query-data/flux/first-last/ /{{< latest "influxdb" "v1" >}}/query_language/functions/#first, InfluxQL – FIRST()	0.7.0

The first() function selects the first non-null record from an input table. first() is a selector function.

first()

{{% warn %}}

Empty tables

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

Parameters

tables

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

Examples

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

import "sampledata"

sampledata.int()
    |> first()

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

Input data

{{% flux/sample "int" %}}

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

Output data

_time	tag	_value
2021-01-01T00:00:00Z	t1	-2

_time	tag	_value
2021-01-01T00:00:00Z	t2	19

{{% /flex-content %}} {{< /flex >}} {{% /expand %}}