---
title: with_bounds() | Tiger Data Docs
description: Add bounds to a gauge aggregate
---

Early access [1.6.0](https://github.com/timescale/timescaledb-toolkit/releases/tag/1.6.0)

Add time bounds to an already-computed gauge aggregate. Bounds are necessary to use extrapolation accessors on the aggregate.

## Samples

Create a gauge aggregate for each `id` and each 15-minute interval. Then add bounds to the gauge aggregate, so you can calculate the extrapolated rate.

```
SELECT
    id,
    bucket,
    extrapolated_rate(
        with_bounds(
            summary,
            time_bucket_range('15 min'::interval, bucket)
        )
    )
FROM (
    SELECT
        id,
        time_bucket('15 min'::interval, ts) AS bucket,
        gauge_agg(ts, val) AS summary
    FROM foo
    GROUP BY id, time_bucket('15 min'::interval, ts)
) t
```

## Arguments

The syntax is:

```
with_bounds(
    summary GaugeSummary,
    bounds TSTZRANGE,
) RETURNS GaugeSummary
```

| Name      | Type           | Default | Required | Description                                                                                                             |
| --------- | -------------- | ------- | -------- | ----------------------------------------------------------------------------------------------------------------------- |
| `summary` | `GaugeSummary` | -       | ✔        | A gauge aggregate created using [`gauge_agg`](/docs/reference/toolkit/counters-and-gauges/gauge_agg/gauge_agg/index.md) |
| `bounds`  | `TSTZRANGE`    | -       | ✔        | A range of `timestamptz` giving the smallest and largest allowed times in the gauge aggregate                           |

## Returns

| Column       | Type         | Description                                   |
| ------------ | ------------ | --------------------------------------------- |
| with\_bounds | GaugeSummary | A new gauge aggregate with the bounds applied |