CG_Distance — Computes the minimum distance between two geometries
double precision CG_Distance( geometry geomA ,  geometry geomB );
Computes the minimum distance between two geometries.
Performed by the SFCGAL module
                 
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                 NOTE: this function returns a double precision value representing the distance.  | 
            
Availability: 3.5.0
            
 Questo metodo richiede il backend SFCGAL. 
            
 Questa funzione supporta i Triangoli e le Triangulated Irregular Network Surfaces (TIN). 
SELECT CG_Distance('LINESTRING(0.0 0.0,-1.0 -1.0)', 'LINESTRING(3.0 4.0,4.0 5.0)');
        cg_distance
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        2.0
        (1 row)