An ST_MultiPolygon is a collection of zero or more ST_Polygon values, and all of the polygons are within the spatial reference system.
Methods of ST_MultiPolygon:
All methods of ST_MultiSurface type can also be called on a ST_MultiPolygon type:
All methods of ST_GeomCollection type can also be called on a ST_MultiPolygon type:
All methods of ST_Geometry type can also be called on a ST_MultiPolygon type:
SQL/MM (ISO/IEC 13249-3: 2006) 9.6
ST_MultiPolygon constructor
ST_MultiPolygonAggr method
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