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\$1Touches
<a name="ST_Touches-function"></a>

ST\$1Touches returns true if the 2D projections of the two input geometries touch. The two geometries touch if they are nonempty, intersect, and have no interior points in common. 

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

```
ST_Touches(geom1, geom2)
```

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

 *geom1*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. 

 *geom2*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. 

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

`BOOLEAN`

If *geom1* or *geom2* is null, then null is returned. 

If *geom1* and *geom2* don't have the same value for the spatial reference system identifier (SRID), then an error is returned. 

If *geom1* or *geom2* is a geometry collection, then an error is returned. 

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

The following SQL checks if a polygon touches a linestring. 

```
SELECT ST_Touches(ST_GeomFromText('POLYGON((0 0,10 0,0 10,0 0))'), ST_GeomFromText('LINESTRING(20 10,20 0,10 0)'));
```

```
 st_touches              
-------------
 t
```