This topic describes the ST_NumInteriorRing function. This function returns the number of interior rings of the input geometry object.

Syntax

integer  ST_NumInteriorRing(geometry  aPolygon);

Parameters

Parameter Description
aPolygon The geometry object that you want to specify.

Examples

SELECT ST_NumInteriorRing('POLYGON((1 0,0 3,3 0,1 0),(1 0,2 0,0 2,1 0))'::geometry);
 st_numinteriorring
--------------------
                  1
(1 row)