ST_ClipByBox2D — Returns the portion of a geometry falling within a rectangle.
geometry ST_ClipByBox2D(geometry geom, box2d box
Clips a geometry by a 2D box in a fast and tolerant but possibly invalid way. Topologically invalid input geometries do not result in exceptions being thrown. The output geometry is not guaranteed to be valid (in particular, self-intersections for a polygon may be introduced).
Performed by the GEOS module.
-- Rely on implicit cast from geometry to box2d for the second parameter SELECT ST_ClipByBox2D(the_geom, ST_MakeEnvelope(0,0,10,10)) FROM mytab;