sym_difference function

Returns a geometry that represents the portions of a and b that do not intersect.

Syntax

sym_difference( geometry a, geometry b)

Arguments

geometry → geometry geometry → geometry

Example

 geom_to_wkt( sym_difference(  geom_from_wkt( 'LINESTRING(3 3 , 4 4 , 5 5)' ) , geom_from_wkt( 'LINESTRING(3 3 , 8 8)' ))   )   → returns LINESTRING(5 5, 8 8)