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SQL:Unione di poligoni

In SQL Server 2012:

SELECT geometry::UnionAggregate(geomcolumn) FROM YourTable;

In SQL Server 2008/R2:

DECLARE @g = geometry::STGeomFromText('GEOMETRYCOLLECTION EMPTY', YourSRID);
SELECT @g = @g.STUnion(geomcolum) FROM YourTable;