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1.7 KiB
1.7 KiB
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deltaSum
Sums the arithmetic difference between consecutive rows. If the difference is negative, it is ignored.
Note that the underlying data must be sorted in order 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
Returned value
- A gained arithmetic difference of the
Integer
orFloat
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 │
└─────────────────────────────────────┘