ST_M

定义

ST_M 以 ST_Point 对象为输入参数，返回其测量 (m) 坐标。

语法

sde.st_m (g1 sde.st_point)

返回类型

数值

示例

Oracle

CREATE TABLE m_test (id integer, geometry sde.st_point);

INSERT INTO M_TEST VALUES (
1,
sde.st_point (2, 3, 32, 5, 0)
);

INSERT INTO M_TEST VALUES (
2,
sde.st_point (4, 5, 20, 4, 0)
);

INSERT INTO M_TEST VALUES (
3,
sde.st_point (3, 8, 23, 7, 0)
);

SELECT id, sde.st_m (geometry) M_COORD
FROM M_TEST; 

        ID    M_COORD

         1          5
         2          4
         3          7

PostgreSQL

CREATE TABLE m_test (id integer, geometry sde.st_point);

INSERT INTO m_test VALUES (
1,
sde.st_point (2, 3, 32, 5, 0)
);

INSERT INTO m_test VALUES (
2,
sde.st_point (4, 5, 20, 4, 0)
);

INSERT INTO m_test VALUES (
3,
sde.st_point (3, 8, 23, 7, 0)
);

SELECT id, sde.st_m (geometry) 
AS M_COORD
FROM m_test; 

        id    m_coord

         1          5
         2          4
         3          7