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\$1SRID
<a name="ST_SRID-function"></a>

ST\$1SRID returns the spatial reference system identifier (SRID) of an input geometry. For more information about an SRID, see [Querying spatial data in Amazon Redshift](geospatial-overview.md).

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

```
ST_SRID(geom)
```

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

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

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

`INTEGER` representing the SRID value of *geom*. 

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

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

The following SQL returns an SRID value of a linestring that is set to SRID `4326`.

```
SELECT ST_SRID(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)',4326));
```

```
st_srid
-------------
 4326
```

The following SQL returns an SRID value of a linestring that is not set when constructed. This results in `0` for the SRID value.

```
SELECT ST_SRID(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
```

```
st_srid
-------------
 0
```