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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