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MULTIPOLYGON

Constructs a MultiPolygon value from a list of WKB Polygon arguments. This function creates a geometry collection containing multiple polygons.

Syntax

MultiPolygon(poly1,poly2,...)

Description

Constructs a WKB MultiPolygon value from a set of WKB Polygon arguments. If any argument is not a WKB Polygon, the return value is NULL.

Example

MultiPolygon_Example:

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CREATE TABLE gis_multi_polygon  (g MULTIPOLYGON);
INSERT INTO gis_multi_polygon VALUES
    (MultiPolygonFromText('MULTIPOLYGON(((28 26,28 0,84 0,84 42,28 26),(52 18,66 23,73 9,48 6,52 18)),
     ((59 18,67 18,67 13,59 13,59 18)))')),
    (MPolyFromText('MULTIPOLYGON(((28 26,28 0,84 0,84 42,28 26),(52 18,66 23,73 9,48 6,52 18)),
        ((59 18,67 18,67 13,59 13,59 18)))')),
    (MPolyFromWKB(AsWKB(MultiPolygon(Polygon(LineString(
       Point(0, 3), Point(3, 3), Point(3, 0), Point(0, 3)))))));

INSERT INTO multipolygon_example VALUES
  (ST_MultiPolygonFromText(
    'MULTIPOLYGON(((0 40, 0 20, 6 30, 12 20, 12 40, 0 40),
    (15 40, 15 20, 25 20, 30 25, 30 35, 25 40, 15 40)))')),
  (ST_MPolyFromText(
    'MULTIPOLYGON(((-5 45, 35 45, 35 15, -5 15, -5 45),
    (0 40, 0 20, 6 30, 12 20, 12 40, 0 40),
    (15 40, 15 20, 25 20, 30 25, 30 35, 25 40, 15 40)))')),
  (MultiPolygon(Polygon(LineString(Point(0, 0), Point(0, 1),
     Point(1, 1), Point(1, 0), Point(0, 0)))));

+-------------------------------------------------------------------------------------------------------------------------------+
| ST_AsWKT(m)                                                                                                                   |
+-------------------------------------------------------------------------------------------------------------------------------+
| MULTIPOLYGON(((0 40,0 20,6 30,12 20,12 40,0 40),(15 40,15 20,25 20,30 25,30 35,25 40,15 40)))                                 |
| MULTIPOLYGON(((-5 45,35 45,35 15,-5 15,-5 45),(0 40,0 20,6 30,12 20,12 40,0 40),(15 40,15 20,25 20,30 25,30 35,25 40,15 40))) |
| MULTIPOLYGON(((0 0,0 1,1 1,1 0,0 0)))                                                                                         |
+-------------------------------------------------------------------------------------------------------------------------------+