---
title: table.fill() function
description: >
  `table.fill()` adds a single row to empty tables in a stream of tables.
menu:
  flux_v0_ref:
    name: table.fill
    parent: experimental/table
    identifier: experimental/table/fill
weight: 201
flux/v0/tags: [transformations, table]
---

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`table.fill()` adds a single row to empty tables in a stream of tables.

Columns that are in the group key are filled with the column value defined in the group key.
Columns not in the group key are filled with a null value.

##### Function type signature

```js
(<-tables: stream[A]) => stream[A] where A: Record
```

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

## Parameters

### tables

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




## Examples

### Fill empty tables

```js
import "experimental/table"
import "sampledata"

data =
    sampledata.int()
        |> filter(fn: (r) => r.tag != "t2", onEmpty: "keep")

data
    |> table.fill()

```

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#### 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 |
| ------ | ------- | ---- |


#### Output 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 |
| ------ | ------- | ---- |
|        |         | t2   |

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