ST_X — Returns the X coordinate of a Point.
float ST_X(
geometry a_point)
;
Return the X coordinate of the point, or NULL if not available. Input must be a point.
To get the minimum and maximum X value of geometry coordinates use the functions ST_XMin and ST_XMax. |
This method implements the SQL/MM specification. SQL-MM 3: 6.1.3
This function supports 3d and will not drop the z-index.
SELECT ST_X(ST_GeomFromEWKT('POINT(1 2 3 4)')); st_x ------ 1 (1 row) SELECT ST_Y(ST_Centroid(ST_GeomFromEWKT('LINESTRING(1 2 3 4, 1 1 1 1)'))); st_y ------ 1.5 (1 row)
ST_Centroid, ST_GeomFromEWKT, ST_M, ST_XMax, ST_XMin, ST_Y, ST_Z