Name
ST_NPoints — Returns the number of points (vertices) in a geometry.
Synopsis
integer ST_NPoints(geometry g1);
Description
Return the number of points in a geometry. Works for all geometries.
Enhanced: 2.0.0 support for Polyhedral surfaces was introduced.
![[Note]](../images/note.png)
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Prior to 1.3.4, this function crashes if used with geometries that contain CURVES. This is fixed in 1.3.4+ |
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
This function supports Polyhedral surfaces.
Examples
SELECT ST_NPoints(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
--result
4
--Polygon in 3D space
SELECT ST_NPoints(ST_GeomFromEWKT('LINESTRING(77.29 29.07 1,77.42 29.26 0,77.27 29.31 -1,77.29 29.07 3)'))
--result
4