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ST_NUMGEOMETRIES

Returns the number of geometries in a GeometryCollection. Returns NULL if the argument is not a GeometryCollection.

Syntax

ST_NumGeometries(gc)
NumGeometries(gc)

Description

Returns the number of geometries in the GeometryCollection gc.

ST_NumGeometries() and NumGeometries() are synonyms.

Example

_{This page is licensed: CC BY-SA / Gnu FDL}

SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))';

SELECT NUMGEOMETRIES(GeomFromText(@gc));
+----------------------------------+
| NUMGEOMETRIES(GeomFromText(@gc)) |
+----------------------------------+
|                                2 |
+----------------------------------+