mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 08:32:02 +00:00
73 lines
1.8 KiB
Markdown
73 lines
1.8 KiB
Markdown
---
|
|
toc_priority: 141
|
|
---
|
|
|
|
# deltaSum {#agg_functions-deltasum}
|
|
|
|
Sums the arithmetic difference between consecutive rows. If the difference is negative, it is ignored.
|
|
|
|
!!! info "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 {#see-also}
|
|
|
|
- [runningDifference](../../functions/other-functions.md#other_functions-runningdifference)
|