class SymDifference(expr1, expr2, **extra)  
Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
Accepts two geographic fields or expressions and returns the geometric symmetric difference (union without the intersection) between the given parameters.
 Changed in Django 1.10: 
                  
    		
    		
    		
    		
    		
            		
    		
    		
    	MySQL support was added.
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