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75 lines
1.9 KiB
Markdown
75 lines
1.9 KiB
Markdown
---
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slug: /en/sql-reference/aggregate-functions/reference/deltasum
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sidebar_position: 141
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---
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# deltaSum
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Sums the arithmetic difference between consecutive rows. If the difference is negative, it is ignored.
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:::note
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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.
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:::
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**Syntax**
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``` sql
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deltaSum(value)
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```
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**Arguments**
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- `value` — Input values, must be [Integer](../../data-types/int-uint.md) or [Float](../../data-types/float.md) type.
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**Returned value**
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- A gained arithmetic difference of the `Integer` or `Float` type.
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**Examples**
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Query:
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``` sql
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SELECT deltaSum(arrayJoin([1, 2, 3]));
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```
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Result:
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``` text
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┌─deltaSum(arrayJoin([1, 2, 3]))─┐
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│ 2 │
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└────────────────────────────────┘
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```
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Query:
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``` sql
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SELECT deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]));
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```
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Result:
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``` text
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┌─deltaSum(arrayJoin([1, 2, 3, 0, 3, 4, 2, 3]))─┐
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│ 7 │
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└───────────────────────────────────────────────┘
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```
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Query:
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``` sql
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SELECT deltaSum(arrayJoin([2.25, 3, 4.5]));
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```
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Result:
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``` text
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┌─deltaSum(arrayJoin([2.25, 3, 4.5]))─┐
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│ 2.25 │
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└─────────────────────────────────────┘
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```
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## See Also
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- [runningDifference](../../functions/other-functions.md#other_functions-runningdifference)
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