An ST_GeomCollection is a collection of zero or more ST_Geometry values.
Methods of ST_GeomCollection:
All methods of ST_Geometry type can also be called on a ST_GeomCollection type:
An ST_GeomCollection is a collection of zero or more ST_Geometry values. All of the values are in the same spatial reference system as the collection value. The ST_GeomCollection type can contain a heterogeneous collection of objects (for example, points, lines, and polygons). Sub-types of ST_GeomCollection can be used to restrict the collection to certain geometry types.
The dimension of the geometry collection value is the largest dimension of its constituents.
A geometry collection is simple if all of the constituents are simple and no two constituent geometries intersect except possibly at their boundaries.
SQL/MM (ISO/IEC 13249-3: 2006) 9.1
ST_GeomCollection constructor
ST_GeomCollectionAggr method
ST_GeometryN method
ST_NumGeometries method
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