---
title: experimental.count() function
description: experimental.count() returns the number of records in each input table.
url: https://docs.influxdata.com/flux/v0/stdlib/experimental/count/
estimated_tokens: 1220
product: Flux
version: v0
---

# experimental.count() function

-   Flux 0.107.0+
-   View InfluxDB support

`experimental.count()` is [subject to change at any time](/flux/v0/stdlib/experimental/#experimental-packages-are-subject-to-change).

`experimental.count()` returns the number of records in each input table.

The count is returned in the `_value` column and counts both null and non-null records.

#### Counts on empty tables

`experimental.count()` returns 0 for empty tables. To keep empty tables in your data, set the following parameters when using the following functions:

```
filter(onEmpty: "keep")
window(createEmpty: true)
aggregateWindow(createEmpty: true)
```

##### Function type signature

```js
(<-tables: stream[{A with _value: B}]) => stream[{A with _value: int}]
```

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

## Parameters

### tables

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

## Examples

### Count the number of rows in a table

```js
import "experimental"
import "sampledata"

sampledata.int()
    |> experimental.count()
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | -2 | t1 |
| 2021-01-01T00:00:10Z | 10 | t1 |
| 2021-01-01T00:00:20Z | 7 | t1 |
| 2021-01-01T00:00:30Z | 17 | t1 |
| 2021-01-01T00:00:40Z | 15 | t1 |
| 2021-01-01T00:00:50Z | 4 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 19 | t2 |
| 2021-01-01T00:00:10Z | 4 | t2 |
| 2021-01-01T00:00:20Z | -3 | t2 |
| 2021-01-01T00:00:30Z | 19 | t2 |
| 2021-01-01T00:00:40Z | 13 | t2 |
| 2021-01-01T00:00:50Z | 1 | t2 |

#### Output data

| *tag | _value |
| --- | --- |
| t1 | 6 |

| *tag | _value |
| --- | --- |
| t2 | 6 |

#### Related

-   [count() function](/flux/v0/stdlib/universe/count/)
-   [InfluxQL – COUNT()](/influxdb/v1/query_language/functions/#count)

[transformations](/flux/v0/tags/transformations/) [aggregates](/flux/v0/tags/aggregates/)