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

geom

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

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