ST_InteriorRingN
Syntax
ST_InteriorRingN(poly,N) InteriorRingN(poly,N)
Description
Returns the N-th interior ring for the Polygon value poly as a LineString. Rings are numbered beginning with 1.
ST_InteriorRingN() and InteriorRingN() 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(InteriorRingN(GeomFromText(@poly),1)); +----------------------------------------------+ | AsText(InteriorRingN(GeomFromText(@poly),1)) | +----------------------------------------------+ | LINESTRING(1 1,1 2,2 2,2 1,1 1) | +----------------------------------------------+
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