11.5.2.7 GeometryCollection Property Analysis Functions

NumGeometries(gc)

Returns the number of geometries in the GeometryCollection value gc.

mysql> SELECT NumGeometries(GeomFromText('GeometryCollection(Point(1 1),LineString(2 2, 3 3))'));
+------------------------------------------------------------------------------------+
| NumGeometries(GeomFromText('GeometryCollection(Point(1 1),LineString(2 2, 3 3))')) |
+------------------------------------------------------------------------------------+
|                                                                                  2 |
+------------------------------------------------------------------------------------+

GeometryN(gc,n)

Returns the n-th geometry in the GeometryCollection value gc. Geometry numbers begin at 1.

mysql> SELECT AsText(GeometryN(GeomFromText('GeometryCollection(Point(1 1),LineString(2 2, 3 3))'),1));
+------------------------------------------------------------------------------------------+
| AsText(GeometryN(GeomFromText('GeometryCollection(Point(1 1),LineString(2 2, 3 3))'),1)) |
+------------------------------------------------------------------------------------------+
| POINT(1 1)                                                                               |
+------------------------------------------------------------------------------------------+

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