ST_MaxZ

定义

ST_MaxZ 以几何对象为输入参数，返回其最大 z 坐标。

语法

sde.st_maxz (g1 sde.st_geometry)

返回类型

数值

如果 z 值不存在，则返回 NULL。

示例

Oracle

CREATE TABLE maxz_test (id integer, geometry sde.st_geometry);

INSERT INTO MAXZ_TEST VALUES (
1901,
sde.st_polygon ('polygon zm((110 120 20 3, 110 140 22 3, 120 130 26 4, 110 120 20 3))', 0)
);

INSERT INTO MAXZ_TEST VALUES (
1902,
sde.st_polygon ('polygon zm((0 0 40 7, 0 4 35 9, 5 4 32 12, 5 0 31 5, 0 0 40 7))', 0)
);

SELECT id, sde.st_maxz (geometry) Max_Z
FROM MAXZ_TEST;

        ID      MAX_Z

      1901         26
      1902         40

PostgreSQL

CREATE TABLE maxz_test (id integer, geometry sde.st_geometry);

INSERT INTO maxz_test VALUES (
1901,
sde.st_polygon ('polygon zm((110 120 20 3, 110 140 22 3, 120 130 26 4, 110 120 20 3))', 0)
);

INSERT INTO maxz_test VALUES (
1902,
sde.st_polygon ('polygon zm((0 0 40 7, 0 4 35 9, 5 4 32 12, 5 0 31 5, 0 0 40 7))', 0)
);

SELECT id, sde.st_maxz (geometry) 
AS Max_Z
FROM maxz_test;

        id      max_z

      1901         26
      1902         40