ST_PointM — Creates a Point with X, Y, M and SRID values.
geometry ST_PointM(float x, float y, float m, integer srid=unknown);
주어진 좌표값을 가진 ST_Point를 반환합니다. ST_MakePoint와 동일한 OGC 함수입니다.
Enhanced: 3.2.0 srid as an extra optional argument was added. Older installs require combining with ST_SetSRID to mark the srid on the geometry.
SELECT ST_PointM(-71.104, 42.315, 3.4, 4326)
SELECT ST_PointM(-71.104, 42.315, 3.4, srid => 4326)
SELECT ST_PointM(-71.104, 42.315, 3.4)