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st_zmin function

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

Preview

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nota

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

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

Syntax​

st_zmin ( geoExpr )

Arguments​

  • geoExpr: A GEOMETRY value.

Returns​

A value of type DOUBLE, equal to the minimum 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​

SQL
-- Returns the minimum Z coordinate of a non-empty geometry with a Z coordinate.
> SELECT st_zmin(st_geomfromtext('LINESTRING Z (10 34 -1,44 57 -2,30 24 -5)'));
  -5.0
-- Returns `NULL` for a non-empty geometry without a Z coordinate.
> SELECT st_zmin(st_geomfromtext('LINESTRING(10 34,44 57,30 24)'));
  NULL
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