설명

ST_Geometry 값의 좌표 차원을 반환합니다.

Values are: 0 = 2D, 1 = 3D-M, 2 = 3D-Z, 3 = 4D.

This function supports 3d and will not drop the z-index.

This method supports Circular Strings and Curves.

예시

SELECT ST_ZMFlag('LINESTRING(1 2,3 4)');

0

SELECT ST_ZMFlag('LINESTRINGM(1 2 3, 3 4 3)');

1

SELECT ST_ZMFlag('CIRCULARSTRING(1 2 3,3 4 3,5 6 3)');

2

SELECT ST_ZMFlag('POINT(1 2 3 4)');

3

참고

ST_CoordDim, ST_NDims, ST_Dimension