Descrizione

Return the number of points in an ST_LineString or ST_CircularString value. Prior to 1.4 only works with linestrings as the specs state. From 1.4 forward this is an alias for ST_NPoints which returns number of vertexes for not just linestrings. Consider using ST_NPoints instead which is multi-purpose and works with many geometry types.

Questo metodo implementa le OGC Simple Features Implementation Specification for SQL 1.1.

Questo metodo implementa la specifica SQL/MM. SQL-MM 3: 7.2.4

Esempi

SELECT ST_NumPoints(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)'));
                --result
                4
                

Si veda anche

ST_NPoints