ST_NDims-PolarDB(PolarDB)-阿里云帮助中心

Returns the coordinate dimension of a meshgeom or sfmesh object as an int2 value. Equivalent to ST_CoordDim.

Syntax

int2 ST_NDims(meshgeom geom);
int2 ST_NDims(sfmesh sfmesh);

Parameter	Description
`geom`	The meshgeom object.
`sfmesh`	The sfmesh object.

SELECT ST_NDims('MESHGEOM(PATCH(INDEXSURFACE M(VERTEX(0 0 2,0 10 3,10 10 1,10 0 1), INDEX((0,1,2),(1,2,3)))))'::meshgeom);

Output:

 st_ndims
----------
        3