st_zmax function

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 17.1 and above

Important

This feature is in Public Preview.

Note

This feature is not available on Databricks SQL Classic warehouses. To learn more about Databricks SQL warehouses, see SQL warehouse types.

Returns the maximum Z coordinate of the input GEOMETRY value, or NULL if the geometry is empty or does not have a Z coordinate.

Syntax

st_zmax ( geoExpr )

Arguments

  • geoExpr: A GEOMETRY value.

Returns

A value of type DOUBLE, equal to the maximum Z coordinate of the input GEOMETRY value.

The function returns NULL if the input is NULL or if the geometry is empty or does not have a Z coordinate.

Examples

-- Returns the maximum Z coordinate of a non-empty geometry with a Z coordinate.
> SELECT st_zmax(st_geomfromtext('LINESTRING Z (10 34 -1,44 57 -2,30 24 -5)'));
  -1.0
-- Returns `NULL` for a non-empty geometry without a Z coordinate.
> SELECT st_zmax(st_geomfromtext('LINESTRING(10 34,44 57,30 24)'));
  NULL
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