Returns the number of interior rings in a Polygon geometry.
Syntax
integer ST_NumInteriorRing(geometry aPolygon);Parameters
| Parameter | Description |
|---|---|
aPolygon | The input Polygon geometry. |
Examples
SELECT ST_NumInteriorRing('POLYGON((1 0,0 3,3 0,1 0),(1 0,2 0,0 2,1 0))'::geometry);
st_numinteriorring
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