This topic describes the ST_NPoints function. This function returns the number of vertexes in a geometry object. This function works for all geometry objects.
Syntax
integer ST_NPoints(geometry g1);Parameters
| Parameter | Description |
|---|---|
| g1 | The geometry object that you want to specify. |
Description
This function supports circular strings, curves, polyhedral surfaces, and 3D objects.
Examples
SELECT ST_NPoints('POLYGON((0 0,0 1,1 1,0 0))'::geometry);
st_npoints
------------
4
(1 row)