ST_X can take an ST_Point as an input parameter and return its x-coordinate.
Oracle
sde.st_x (pt1 sde.st_point)
PostgreSQL
st_x (pt1 st_point)
The x_test table is created with two columns: the gid column, which uniquely identifies the row, and the pt1 point column.
Oracle
CREATE TABLE x_test (gid integer unique, pt1 sde.st_point);
PostgreSQL
CREATE TABLE x_test (gid integer unique, pt1 st_point);
The INSERT statements insert two rows. One is a point without a z-coordinate or measure. The other column has both a z-coordinate and measure.
Oracle
INSERT INTO x_test VALUES (
1,
sde.st_pointfromtext ('point (10.02 20.01)', 0)
);
INSERT INTO x_test VALUES (
2,
sde.st_pointfromtext ('point zm(10.02 20.01 5 7)', 0)
);
PostgreSQL
INSERT INTO x_test VALUES (
1,
st_point ('point (10.02 20.01)', 0)
);
INSERT INTO x_test VALUES (
2,
st_point ('point zm(10.02 20.01 5 7)', 0)
);
The query lists the gid column and the double-precision x-coordinate of the points.
Oracle
SELECT gid, sde.st_x (pt1) "The X coordinate"
FROM x_test;
GID The X coordinate
1 10.02
2 10.02
PostgreSQL
SELECT gid, st_x (pt1) AS "The X coordinate"
FROM x_test;
gid The X coordinate
1 10.02
2 10.02