Name

ST_ExteriorRing — Returns an external (the very first) ring of a polygon.

Synopsis

ST_ExteriorRing ( in poligon any );

Description

Returns an external (the very first) ring of a polygon.

Parameters

poligon

A given poligon from a type shape.

Return Types

Returns any.

Examples

Example24.659.Simple Use

SQL> select ST_ExteriorRing (st_ewkt_read ('POLYGON((1 3,2 4,1 5,0 4,1 3),(1 3.5,1.5 4,1 4.5,0.5 4,1 3.5))'))
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RING(1.0 3.0,2.0 4.0,1.0 5.0,0.0 4.0,1.0 3.0)