---
title: state_timeline() | Tiger Data Docs
description: Get a timeline of all states from a state aggregate
---

Since [1.15.0](https://github.com/timescale/timescaledb-toolkit/releases/tag/1.15.0)

Get a timeline of all states, showing each time a state is entered and exited.

If you have multiple state aggregates and need to interpolate the state across interval boundaries, use [`interpolated_state_timeline`](/docs/reference/toolkit/state-tracking/state_agg/interpolated_state_timeline/index.md).

## Samples

Get the history of states from a state aggregate.

```
SELECT state, start_time, end_time
  FROM state_timeline(
    (SELECT state_agg(ts, state) FROM states_test)
  );
```

Returns:

```
 state |       start_time       |        end_time
-------+------------------------+------------------------
 START | 2020-01-01 00:00:00+00 | 2020-01-01 00:00:11+00
 OK    | 2020-01-01 00:00:11+00 | 2020-01-01 00:01:00+00
 ERROR | 2020-01-01 00:01:00+00 | 2020-01-01 00:01:03+00
 OK    | 2020-01-01 00:01:03+00 | 2020-01-01 00:02:00+00
 STOP  | 2020-01-01 00:02:00+00 | 2020-01-01 00:02:00+00
```

## Arguments

The syntax is:

```
state_timeline(
    agg StateAgg
) RETURNS (TEXT, TIMESTAMPTZ, TIMESTAMPTZ)


state_int_timeline(
    agg StateAgg
) RETURNS (BIGINT, TIMESTAMPTZ, TIMESTAMPTZ)
```

| Name | Type     | Default | Required | Description                                |
| ---- | -------- | ------- | -------- | ------------------------------------------ |
| agg  | StateAgg | -       | ✔        | The aggregate from which to get a timeline |

## Returns

| Column      | Type        | Description                                 |
| ----------- | ----------- | ------------------------------------------- |
| state       | TEXT        | BIGINT                                      |
| start\_time | TIMESTAMPTZ | The time when the state started (inclusive) |
| end\_time   | TIMESTAMPTZ | The time when the state ended (exclusive)   |