InteriorRingN
Sintassi
InteriorRingN(poligono, N)
Spiegazione
Restituisce l'Nesimo anello interno del poligono come LineString. Gli anelli sono numerati a partire da 1.
Esempi
MariaDB [(none)]> SET @poly =
-> 'Polygon((0 0,0 3,3 3,3 0,0 0),(1 1,1 2,2 2,2 1,1 1))';
MariaDB [(none)]> SELECT AsText(InteriorRingN(GeomFromText(@poly),1));
+----------------------------------------------+
| AsText(InteriorRingN(GeomFromText(@poly),1)) |
+----------------------------------------------+
| LINESTRING(1 1,1 2,2 2,2 1,1 1) |
+----------------------------------------------+
1 row in set (0.00 sec)
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