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STSymDifference (geometry Data Type)

Returns an object representing all points that are either in one geometry instance or another geometry instance, but not those points that lie in both instances.


.STSymDifference ( other_geometry )
other_geometry

Is another geometry instance in addition to the instance on which STSymDistance() is being invoked.

SQL Server return type: geometry

CLR return type: SqlGeometry

This method always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match.

The following example uses STSymDifference() to compute the symmetric difference of two Polygon instances.

DECLARE @g geometry;
DECLARE @h geometry;
SET @g = geometry::STGeomFromText('POLYGON((0 0, 0 2, 2 2, 2 0, 0 0))', 0);
SET @h = geometry::STGeomFromText('POLYGON((1 1, 3 1, 3 3, 1 3, 1 1))', 0);
SELECT @g.STSymDifference(@h).ToString();
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