[postgis-users] Spatial queries using @ operator

Gastón Lucero gaston.lucero at sitrack.com
Fri Sep 17 13:44:10 PDT 2010


Hello,i´m from argentina, so excuse my english.
My problem is i have a table with 500000 record,polygons and points type 
and i have to find objects which intersects with an boundary in particular

Example of ,my query
select * from zone where  geometry @ (select geometry from othertable 
where id=1)

My table definition:
CREATE TABLE "zone"
(
   zoneid integer NOT NULL DEFAULT nextval('zonas_id_seq'::regclass),
   "name" text,
   buffer integer,
   description text,
   layerid integer,
   geometry geometry,
   color integer,
   CONSTRAINT zone_pk PRIMARY KEY (zoneid),
   CONSTRAINT enforce_dims_geometry CHECK (st_ndims(geometry) = 2),
   CONSTRAINT enforce_srid_geometry CHECK (st_srid(geometry) = 4326)
)
WITH (
   OIDS=FALSE
);
ALTER TABLE "zone" OWNER TO postgres;

-- Index: idx_zone_geometry

-- DROP INDEX idx_zone_geometry;

CREATE INDEX idx_zone_geometry
   ON "zone"
   USING gist
   (geometry);

-- Index: idx_zone_zoneid

-- DROP INDEX idx_zone_zoneid;

CREATE INDEX idx_zone_zoneid
   ON "zone"
   USING btree
   (zoneid);

I  have test of differents ways to accelerate my query with other 
functions like st_distance,st_dwithin,etc
but do not know which to use

Thanks



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