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Returns the closure of the combinatorial boundary of this Geometry. ST_Boundary

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Signatures

ST_Boundary(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_Boundary(ST_GeomFromWKT('POLYGON((1 1,0 0, -1 1, 1 1))'))

LINESTRING (1 1, 0 0, -1 1, 1 1)