Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, 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/). 

# ST\$1AsEWKB
<a name="ST_AsEWKB-function"></a>

ST\$1AsEWKB returns the extended well-known binary (EWKB) representation of an input geometry. For 3DZ, 3DM, and 4D geometries, ST\$1AsEWKB uses the Open Geospatial Consortium (OGC) standard value for the geometry type.

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

```
ST_AsEWKB(geom)
```

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

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

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

`VARBYTE`

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

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

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

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

```
st_asewkb
--------------------------------
0103000020E61000000100000005000000000000000000000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F000000000000F03F000000000000000000000000000000000000000000000000
```