ST_Collect — Creates a GeometryCollection or Multi* geometry from a set of geometries.
geometry ST_Collect(
geometry g1, geometry g2)
;
geometry ST_Collect(
geometry[] g1_array)
;
geometry ST_Collect(
geometry set g1field)
;
Collects geometries into a geometry collection. The result is either a Multi* or a GeometryCollection, depending on whether the input geometries have the same or different types (homogeneous or heterogeneous). The input geometries are left unchanged within the collection.
Variant 1: accepts two input geometries
Variant 2: accepts an array of geometries
Variant 3: aggregate function accepting a rowset of geometries.
If any of the input geometries are collections (Multi* or GeometryCollection) ST_Collect returns a GeometryCollection (since that is the only type which can contain nested collections). To prevent this, use ST_Dump in a subquery to expand the input collections to their atomic elements (see example below). |
ST_Collect and ST_Union appear similar, but in fact operate quite differently. ST_Collect aggregates geometries into a collection without changing them in any way. ST_Union geometrically merges geometries where they overlap, and splits linestrings at intersections. It may return single geometries when it dissolves boundaries. |
Availability: 1.4.0 - ST_Collect(geomarray) was introduced. ST_Collect was enhanced to handle more geometries faster.
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves
Collect 2D points.
SELECT ST_AsText( ST_Collect( ST_GeomFromText('POINT(1 2)'), ST_GeomFromText('POINT(-2 3)') )); st_astext ---------- MULTIPOINT((1 2),(-2 3))
Collect 3D points.
SELECT ST_AsEWKT( ST_Collect( ST_GeomFromEWKT('POINT(1 2 3)'), ST_GeomFromEWKT('POINT(1 2 4)') ) ); st_asewkt ------------------------- MULTIPOINT(1 2 3,1 2 4)
Collect curves.
SELECT ST_AsText( ST_Collect( 'CIRCULARSTRING(220268 150415,220227 150505,220227 150406)', 'CIRCULARSTRING(220227 150406,2220227 150407,220227 150406)')); st_astext ------------------------------------------------------------------------------------ MULTICURVE(CIRCULARSTRING(220268 150415,220227 150505,220227 150406), CIRCULARSTRING(220227 150406,2220227 150407,220227 150406))
Using an array constructor for a subquery.
SELECT ST_Collect( ARRAY( SELECT geom FROM sometable ) );
Using an array constructor for values.
SELECT ST_AsText( ST_Collect( ARRAY[ ST_GeomFromText('LINESTRING(1 2, 3 4)'), ST_GeomFromText('LINESTRING(3 4, 4 5)') ] )) As wktcollect; --wkt collect -- MULTILINESTRING((1 2,3 4),(3 4,4 5))