Re: Slow query: Select all buildings that have >1 pharmacies and >1 schools within 1000m - Mailing list pgsql-performance

On 7 Srpen 2012, 14:22, Stefan Keller wrote:
> Your proposal lacks the requirement that it's the same building from
> where pharmacies and schools are reachable.
> But I think about.

I don't know the dataset so I've expected the osm_id to identify the
building - then the intersect should work as AND for the conditions.

And I see I've forgot to include the 'is building' condition, so it should
be like this:

 SELECT b.osm_id FROM osm_poi AS p, osm_polygon b
    WHERE p.tags @> hstore('amenity','pharmacy')
    AND b.tags @> hstore('building','yes')
    AND ST_DWithin(b.way,p.way,1000)
 INTERSECT
 SELECT b.osm_id FROM osm_poi AS p, osm_polygon b
    WHERE p.tags @> hstore('amenity','school')
    AND b.tags @> hstore('building','yes')
    AND ST_DWithin(b.way,p.way,1000)

Tomas