ClickHouse/docs/en/sql-reference/aggregate-functions/reference/deltasum.md

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sidebar_position: 141
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# deltaSum

Sums the arithmetic difference between consecutive rows. If the difference is negative, it is ignored.

:::note
The underlying data must be sorted for this function to work properly. If you would like to use this function in a [materialized view](../../../sql-reference/statements/create/view.md#materialized), you most likely want to use the [deltaSumTimestamp](../../../sql-reference/aggregate-functions/reference/deltasumtimestamp.md#agg_functions-deltasumtimestamp) method instead.
:::

**Syntax**

``` sql
deltaSum(value)
```

**Arguments**

-   `value` — Input values, must be [Integer](../../data-types/int-uint.md) or [Float](../../data-types/float.md) type.

**Returned value**

- A gained arithmetic difference of the `Integer` or `Float` type.

**Examples**

Query:

``` sql
SELECT deltaSum(arrayJoin([1, 2, 3]));
```

Result:

``` text
┌─deltaSum(arrayJoin([1, 2, 3]))─┐
│                              2 │
└────────────────────────────────┘
```

Query:

``` sql
SELECT deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]));
```

Result:

``` text
┌─deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]))─┐
│                                             7 │
└───────────────────────────────────────────────┘
```

Query:

``` sql
SELECT deltaSum(arrayJoin([2.25, 3, 4.5]));
```

Result:

``` text
┌─deltaSum(arrayJoin([2.25, 3, 4.5]))─┐
│                                2.25 │
└─────────────────────────────────────┘
```

## See Also

-   [runningDifference](../../functions/other-functions.md#other_functions-runningdifference)