ST_Boundary

Returns the closure of the combinatorial boundary of this Geometry.

Signatures

ST_Boundary(geom: Geometry)

geom

Geometry

required

The input geometry.

The resulting geometry.

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

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

⌘I