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 that was published on June 30, 2025.

ST_IsValid

ST_IsValid returns true if the 2D projection of the input geometry is valid. For more information about the definition of a valid geometry, see Geometric validity.

Syntax

ST_IsValid(geom)

Arguments

Return type

BOOLEAN

If geom is null, then null is returned.

Examples

The following SQL checks if the specified polygon is valid. In this example, the polygon is invalid because the interior of the polygon isn't simply connected.

SELECT ST_IsValid(ST_GeomFromText('POLYGON((0 0,10 0,10 10,0 10,0 0),(5 0,10 5,5 10,0 5,5 0))'));

 st_isvalid
-----------
 false