NumInteriorRings
Sintassi
NumInteriorRings(poligono)
Spiegazione
Restituisce il numero di anelli interni nel poligono.
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 NumInteriorRings(GeomFromText(@poly));
+---------------------------------------+
| NumInteriorRings(GeomFromText(@poly)) |
+---------------------------------------+
| 1 |
+---------------------------------------+
1 row in set (0.01 sec)
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