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

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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, you most likely want to use the deltaSumTimestamp method instead. :::

Syntax

deltaSum(value)

Arguments

• value — Input values, must be Integer or Float type.

Returned value

• A gained arithmetic difference of the Integer or Float type.

Examples

Query:

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

Result:

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

Query:

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

Result:

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

Query:

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

Result:

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

See Also

• runningDifference