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ST_IsSimple

ST_IsSimple returns true if the 2D projection of the input geometry is simple. For more information about the definition of a simple geometry, see Geometric simplicity.

Syntax

ST_IsSimple(geom)

Arguments

Return type

BOOLEAN

If geom is null, then null is returned.

Examples

The following SQL checks if the specified linestring is simple. In this example, it isn't simple because it has self-intersection.

SELECT ST_IsSimple(ST_GeomFromText('LINESTRING(0 0,10 0,5 5,5 -5)'));

 st_issimple
-----------
 false