The Ultimate Guide to High Availability with MariaDB

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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