ST_DIMENSION

Syntax

ST_Dimension(g)
Dimension(g)

Description

Returns the inherent dimension of the geometry value g. The result can be

Dimension	Definition
`-1`	empty geometry
`0`	geometry with no length or area
`1`	geometry with no area but nonzero length
`2`	geometry with nonzero area

ST_Dimension() and Dimension() are synonyms.

Examples

SELECT Dimension(GeomFromText('LineString(1 1,2 2)'));
+------------------------------------------------+
| Dimension(GeomFromText('LineString(1 1,2 2)')) |
+------------------------------------------------+
|                                              1 |
+------------------------------------------------+

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https://mariadb.com/kb/en/st_dimension/