Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/) that was published on June 30, 2025. 

# ST\_AsHexEWKB
<a name="ST_AsHexEWKB-function"></a>

ST\_AsHexEWKB returns the extended well-known binary (EWKB) representation of an input geometry or geography using ASCII hexadecimal characters (0–9, A–F). For 3DZ, 3DM, and 4D geometries or geographies, ST\_AsHexEWKB uses the PostGIS extended WKB value for the geometry or geography type.

## Syntax
<a name="ST_AsHexEWKB-function-syntax"></a>

```
ST_AsHexEWKB(geo)
```

## Arguments
<a name="ST_AsHexEWKB-function-arguments"></a>

 *geo*   
A value of data type `GEOMETRY` or `GEOGRAPHY`, or an expression that evaluates to a `GEOMETRY` or `GEOGRAPHY` type.

## Return type
<a name="ST_AsHexEWKB-function-return"></a>

`VARCHAR`

If *geo* is null, then null is returned. 

If the result is larger than a 64-KB `VARCHAR`, then an error is returned. 

## Examples
<a name="ST_AsHexEWKB-function-examples"></a>

The following SQL returns the hexadecimal EWKB representation of a polygon in a geometry. 

```
SELECT ST_AsHexEWKB(ST_GeomFromText('POLYGON((0 0,0 1,1 1,1 0,0 0))',4326));
```

```
st_ashexewkb
--------------------------------
0103000020E61000000100000005000000000000000000000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F000000000000F03F000000000000000000000000000000000000000000000000
```

The following SQL returns the hexadecimal EWKB representation of a polygon in a geography. 

```
SELECT ST_AsHexEWKB(ST_GeogFromText('POLYGON((0 0,0 1,1 1,1 0,0 0))'));
```

```
st_ashexewkb
--------------------------------
0103000020E61000000100000005000000000000000000000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F000000000000F03F000000000000000000000000000000000000000000000000
```

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon Redshift. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query redshift` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).