ST_NumPoints
ST_NumPoints returns the number of points in an input geometry.
Syntax
ST_NumPoints(geom)
Arguments
- geom
-
A value of data type
GEOMETRY
or an expression that evaluates to aGEOMETRY
type.
Return type
INTEGER
If geom is null, then null is returned.
If geom is not of subtype LINESTRING
, then null is returned.
Examples
The following SQL returns the number of points in the input linestring.
SELECT ST_NumPoints(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
st_numpoints
-------------
4
The following SQL returns null because the input geom is not of subtype LINESTRING
.
SELECT ST_NumPoints(ST_GeomFromText('MULTIPOINT(1 2,3 4)'));
st_numpoints
-------------