fungsi st_numinteriorrings

Berlaku untuk:disetujui Databricks Runtime 17.3 ke atas

Penting

Fitur ini ada di Pratinjau Umum.

Mengembalikan jumlah cincin interior poligon input.

Syntax

st_numinteriorrings ( geoExpr )

Arguments

  • geoExpr: Nilai GEOGRAPHY atau GEOMETRY.

Pengembalian Barang

Yang INTEGER menentukan jumlah cincin interior dalam poligon input.

Catatan

Fungsi mengembalikan NULL jika input adalah NULL.

Kondisi kesalahan

Examples

-- Example taking an empty 2D polygon GEOMETRY.
> SELECT ST_NumInteriorRings(ST_GeomFromText('POLYGON EMPTY', 4326));
  0
-- Example taking a 3DZ polygon GEOGRAPHY with one non-empty ring.
> SELECT ST_NumInteriorRings(ST_GeogFromText('POLYGON Z ((0 0 6,1 0 6,1 1 8,0 1 6,0 0 6))'));
  0
-- Example taking a 4D polygon GEOMETRY with two rings.
> SELECT ST_NumInteriorRings(ST_GeomFromText('POLYGON ZM ((0 0 111 -11,10 0 222 -22,0 10 333 -33,0 0 444 -44),(1 1 555 -55,4 1 666 -66,1 4 777 -77,1 1 888 -88))', 4326));
  1
-- Example taking a 3DM polygon GEOGRAPHY with three rings.
> SELECT ST_NumInteriorRings(ST_GeogFromText('POLYGON M ((0 0 1,10 0 2,0 10 3,0 0 1),(1 1 2,2 1 3,1 2 4,1 1 2),(3 3 3,3 2 4,2 3 5,3 3 3))'));
  2
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