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union - MULTIPOLYGON (two Polygons)
:memory: #use in-memory database
SELECT AsText(ST_ForceLHR(GUnion(GeomFromText('POLYGON((10 10, 15 10, 15 15, 10 15, 10 10))'), GeomFromText('POLYGON((1 1, 2 1, 2 2, 1 2, 1 1))'))));
1 # rows (not including the header row)
1 # columns
AsText(ST_ForceLHR(GUnion(GeomFromText('POLYGON((10 10, 15 10, 15 15, 10 15, 10 10))'), GeomFromText('POLYGON((1 1, 2 1, 2 2, 1 2, 1 1))'))))
MULTIPOLYGON(((10 10, 10 15, 15 15, 15 10, 10 10)), ((1 1, 1 2, 2 2, 2 1, 1 1)))
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