ExteriorRing
Sintassi
ExteriorRing(poligono)
Spiegazione
Restituisce l'anello esterno del poligono come LineString.
Examples:
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(ExteriorRing(GeomFromText(@poly)));
+-------------------------------------------+
| AsText(ExteriorRing(GeomFromText(@poly))) |
+-------------------------------------------+
| LINESTRING(0 0,0 3,3 3,3 0,0 0) |
+-------------------------------------------+
1 row in set (0.00 sec)
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