ST_NumPoints-ApsaraDB RDS(RDS)-阿里云帮助中心

Returns the number of points in a LineString or CircularString geometry object.

Syntax

integer ST_NumPoints(geometry g1);

Parameters

Parameter	Description
`g1`	The geometry object.

Description

ST_NumPoints is an alias for ST_NPoints. Use ST_NPoints instead — it can be used in multiple scenarios and works with many types of geometry objects, not just LineString and CircularString.

Examples

SELECT ST_NumPoints('LineString(0 0,0 1,1 1)'::geometry);
 st_numpoints
--------------
            3
(1 row)