ST_SymDifference

Introduction: Return the symmetrical difference between geometry A and B (return parts of geometries which are in either of the sets, but not in their intersection)

Format: ST_SymDifference (A:geometry, B:geometry)

Example:

SELECT ST_SymDifference(ST_GeomFromWKT('POLYGON ((-3 -3, 3 -3, 3 3, -3 3, -3 -3))'), ST_GeomFromWKT('POLYGON ((-2 -3, 4 -3, 4 3, -2 3, -2 -3))'))

Result:

MULTIPOLYGON (((-2 -3, -3 -3, -3 3, -2 3, -2 -3)), ((3 -3, 3 3, 4 3, 4 -3, 3 -3)))