77 lines
1.9 KiB
Markdown
77 lines
1.9 KiB
Markdown
---
|
||
title: last() function
|
||
description: The `last()` function selects the last non-null record from an input table.
|
||
aliases:
|
||
- /influxdb/v2.0/reference/flux/functions/transformations/selectors/last
|
||
- /influxdb/v2.0/reference/flux/functions/built-in/transformations/selectors/last/
|
||
- /influxdb/v2.0/reference/flux/stdlib/built-in/transformations/selectors/last/
|
||
- /influxdb/cloud/reference/flux/stdlib/built-in/transformations/selectors/last/
|
||
menu:
|
||
flux_0_x_ref:
|
||
name: last
|
||
parent: universe
|
||
weight: 102
|
||
flux/v0.x/tags: [selectors, transformations]
|
||
related:
|
||
- /{{< latest "influxdb" >}}/query-data/flux/first-last/
|
||
- /{{< latest "influxdb" "v1" >}}/query_language/functions/#last, InfluxQL – LAST()
|
||
introduced: 0.7.0
|
||
---
|
||
|
||
The `last()` function selects the last non-null record from an input table.
|
||
_`last()` is a [selector function](/flux/v0.x/function-types/#selectors)._
|
||
|
||
```js
|
||
last(column: "_value")
|
||
```
|
||
|
||
{{% warn %}}
|
||
#### Empty tables
|
||
`last()` drops empty tables.
|
||
{{% /warn %}}
|
||
|
||
## Parameters
|
||
|
||
### column {data-type="string"}
|
||
Column used to verify the existence of a value.
|
||
If this column is _null_ in the last record, `last()` returns the previous
|
||
record with a non-null value.
|
||
Default is `"_value"`.
|
||
|
||
### tables {data-type="stream of tables"}
|
||
Input data.
|
||
Default is piped-forward data ([`<-`](/flux/v0.x/spec/expressions/#pipe-expressions)).
|
||
|
||
## Examples
|
||
{{% flux/sample-example-intro %}}
|
||
|
||
```js
|
||
import "sampledata"
|
||
|
||
sampledata.int()
|
||
|> last()
|
||
```
|
||
|
||
{{% expand "View input and output" %}}
|
||
{{< flex >}}
|
||
{{% flex-content %}}
|
||
|
||
##### Input data
|
||
{{% flux/sample "int" %}}
|
||
|
||
{{% /flex-content %}}
|
||
{{% flex-content %}}
|
||
|
||
##### Output data
|
||
| tag | _time | _value |
|
||
| :-- | :------------------- | -----: |
|
||
| t1 | 2021-01-01T00:00:50Z | 4 |
|
||
|
||
| tag | _time | _value |
|
||
| :-- | :------------------- | -----: |
|
||
| t2 | 2021-01-01T00:00:50Z | 1 |
|
||
|
||
{{% /flex-content %}}
|
||
{{< /flex >}}
|
||
{{% /expand %}}
|