---
title: ES|QL IDELTA function
description: 
url: https://www.elastic.co/docs/reference/query-languages/esql/functions-operators/time-series-aggregation-functions/idelta
products:
  - Elasticsearch
---

# ES|QL IDELTA function
<applies-to>
  - Elastic Stack: Generally available since 9.4
  - Elastic Stack: Preview from 9.2 to 9.3
</applies-to>


## Syntax

![Embedded](https://www.elastic.co/docs/reference/query-languages/esql/images/generated/x-pack-esql/functions/idelta.svg)


## Parameters

<definitions>
  <definition term="field">
    the metric field to calculate the value for
  </definition>
  <definition term="window">
    the time window over which to compute the idelta over time
  </definition>
</definitions>


## Description

Calculates the idelta of a gauge. idelta is the absolute change between the last two data points (it ignores all but the last two data points in each time period). This function is very similar to delta, but is more responsive to recent changes.

## Supported types


| field   | window                                                                  | result |
|---------|-------------------------------------------------------------------------|--------|
| double  | time_duration <applies-to>Elastic Stack: Preview since 9.3</applies-to> | double |
| integer | time_duration <applies-to>Elastic Stack: Preview since 9.3</applies-to> | double |
| long    | time_duration <applies-to>Elastic Stack: Preview since 9.3</applies-to> | double |


## Example

```esql
TS k8s
| STATS events = SUM(IDELTA(events_received)) by pod, time_bucket = TBUCKET(10minute)
```


| events:double | pod:keyword | time_bucket:datetime     |
|---------------|-------------|--------------------------|
| 9.0           | one         | 2024-05-10T00:10:00.000Z |
| 7.0           | three       | 2024-05-10T00:10:00.000Z |
| 3.0           | two         | 2024-05-10T00:00:00.000Z |
| 0.0           | two         | 2024-05-10T00:20:00.000Z |