st_numgeometries Função

Aplica-se a: Databricks SQL Databricks Runtime 17.1 e superior

Devolve o número de geometrias no valor de entrada GEOMETRY .

Syntax

st_numgeometries ( geoExpr )

Arguments

• geoExpr: Um GEOMETRY valor.

Returns

Um valor do tipo INT, que representa o número de geometrias no valor de entrada GEOMETRY .

A função retorna NULL se a entrada for NULL.

Examples

-- Returns the number of geometries in a non-empty multipoint geometry.
> SELECT st_numgeometries(st_geomfromtext('MULTIPOINT(10 34,44 57,EMPTY)'));
  3
-- Returns the number of geometries in an empty polygon geometry.
> SELECT st_numgeometries(st_geomfromtext('POLYGON EMPTY'));
  0
-- Returns the number of geometries in a non-empty polygon geometry.
> SELECT st_numgeometries(st_geomfromtext('POLYGON((0 0,1 0,1 1,0 1,0 0))'));
  1
-- Returns the number of geometries in a non-empty geometry collection.
> SELECT st_numgeometries(st_geomfromtext('GEOMETRYCOLLECTION(LINESTRING EMPTY,GEOMETRYCOLLECTION(POINT(1 2),POLYGON((0 0,1 0,0 1,0 0))))'));
  2

Funções relacionadas

• st_dump Função
• st_geometryn Função