Name
ST_YMax — Returns the Y maxima of a 2D or 3D bounding box or a geometry.
Synopsis
float ST_YMax(box3d aGeomorBox2DorBox3D);
설명
Returns the Y maxima of a 2D or 3D bounding box or a geometry.
![[Note]](../images/note.png)
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Although this function is only defined for box3d, it also works for box2d and geometry values due to automatic casting. However it will not accept a geometry or box2d text representation, since those do not auto-cast. |
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
예시
SELECT ST_YMax('BOX3D(1 2 3, 4 5 6)');
5
SELECT ST_YMax(ST_GeomFromText('LINESTRING(1 3 4, 5 6 7)'));
6
SELECT ST_YMax(CAST('BOX(-3 2, 3 4)' AS box2d));
4
Observe THIS DOES NOT WORK because it will try to auto-cast the string representation to a BOX3D.
SELECT ST_YMax('LINESTRING(1 3, 5 6)');
ERROR: BOX3D parser - doesn't start with BOX3D(
SELECT ST_YMax(ST_GeomFromEWKT('CIRCULARSTRING(220268 150415 1,220227 150505 2,220227 150406 3)'));
150506.126829327