ST_ExteriorRing
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MariaDB starting with 5.3.3
ST_ExteriorRing was added as a synonym for ExteriorRing in MariaDB 5.3.3.
Syntax
ST_ExteriorRing(poly) ExteriorRing(poly)
Description
Returns the exterior ring of the Polygon value poly
as a LineString.
ST_ExteriorRing()
and ExteriorRing()
are synonyms.
Examples
SET @poly = 'Polygon((0 0,0 3,3 3,3 0,0 0),(1 1,1 2,2 2,2 1,1 1))'; SELECT AsText(ExteriorRing(GeomFromText(@poly))); +-------------------------------------------+ | AsText(ExteriorRing(GeomFromText(@poly))) | +-------------------------------------------+ | LINESTRING(0 0,0 3,3 3,3 0,0 0) | +-------------------------------------------+
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