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Returns a line string representing the exterior ring of the POLYGON geometry. Return NULL if the geometry is not a polygon. ST_ExteriorRing

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Signatures

ST_ExteriorRing(geom: Geometry)

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Parameters

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geom
Geometry
required
The input geometry.

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Return type

The resulting geometry.

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Example

SELECT ST_ExteriorRing(ST_GeomFromText('POLYGON((0 0 1, 1 1 1, 1 2 1, 1 1 1, 0 0 1))'))

LINESTRING (0 0, 1 1, 1 2, 1 1, 0 0)