---
title: cumulativeSum() function
description: >
  `cumulativeSum()`  computes a running sum for non-null records in a table.
menu:
  flux_v0_ref:
    name: cumulativeSum
    parent: universe
    identifier: universe/cumulativeSum
weight: 101
flux/v0/tags: [transformations]
introduced: 0.7.0
---

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`cumulativeSum()`  computes a running sum for non-null records in a table.

The output table schema will be the same as the input table.

##### Function type signature

```js
(<-tables: stream[A], ?columns: [string]) => stream[B] where A: Record, B: Record
```

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

## Parameters

### columns

List of columns to operate on. Default is `["_value"]`.



### tables

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




## Examples

### Return the running total of values in each table

```js
import "sampledata"

sampledata.int()
    |> cumulativeSum()

```

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{{% expand "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

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 8       | t1   |
| 2021-01-01T00:00:20Z | 15      | t1   |
| 2021-01-01T00:00:30Z | 32      | t1   |
| 2021-01-01T00:00:40Z | 47      | t1   |
| 2021-01-01T00:00:50Z | 51      | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 23      | t2   |
| 2021-01-01T00:00:20Z | 20      | t2   |
| 2021-01-01T00:00:30Z | 39      | t2   |
| 2021-01-01T00:00:40Z | 52      | t2   |
| 2021-01-01T00:00:50Z | 53      | t2   |

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