id,page,ref,title,content,breadcrumbs,references
spatialite:querying-polygons-using-within,spatialite,querying-polygons-using-within,Querying polygons using within(),"The  within()  SQL function can be used to check if a point is within a geometry: 
             select
    name
from
    places
where
   within(GeomFromText('POINT(-3.1724366 51.4704448)'), places.geom); 
             The  GeomFromText()  function takes a string of well-known text. Note that the order used here is  longitude  then   latitude . 
             To run that same  within()  query in a way that benefits from the spatial index, use the following: 
             select
    name
from
    places
where
    within(GeomFromText('POINT(-3.1724366 51.4704448)'), places.geom)
    and rowid in (
        SELECT pkid FROM idx_places_geom
        where xmin < -3.1724366
        and xmax > -3.1724366
        and ymin < 51.4704448
        and ymax > 51.4704448
    );","[""SpatiaLite""]",[]