SELECT xmin(envelope(GeomUnion(the_geom))) as xmin, ymin(envelope(GeomUnion(the_geom))) as ymin, xmax(envelope(GeomUnion(the_geom))) as xmax, ymax(envelope(GeomUnion(the_geom))) as ymax, x(centroid(GeomUnion(the_geom))) as centro_x, y(centroid(GeomUnion(the_geom))) as centro_y FROM geometrias WHERE id_tipo=1 AND id_lugar IN ('') AND id_pais={extend:{"x":,"y":,"xmin":,"ymin":,"xmax":,"ymax":}, hoteles:[]}