Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026.
We will start enforcing it in phases. For more information on the details of Python end of life
and migration options, see the
blog post
ST_NumPoints
ST_NumPoints returns the number of points in an input geometry.
Syntax
ST_NumPoints(geom)
Arguments
- geom
-
A value of data type
GEOMETRYor an expression that evaluates to aGEOMETRYtype.
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
-------------