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Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025. If you would like to use Python UDFs, create the UDFs prior to that date. Existing Python UDFs will continue to function as normal. For more information, see the blog post .

ST_NumPoints

ST_NumPoints returns the number of points in an input geometry.

Syntax

ST_NumPoints(geom)

Arguments

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
-------------