Postgres

psql
\connect nombrebd


ST_Distance(geometry g1, geometry g2);

SELECT ST_Distance(
    ST_Transform(ST_GeomFromText('POINT(-72.1235 42.3521)',4326),32717),
    ST_Transform(ST_GeomFromText('LINESTRING(-72.1260 42.45, -72.123 42.1546)', 4326),32717)
  );
st_distance

en metros 

# SELECT PostGIS_version();
            postgis_version            
---------------------------------------
 2.1 USE_GEOS=1 USE_PROJ=1 USE_STATS=1
(1 row)