On 10 July 2012 06:53, Roba Binyahib <roba.binya...@kaust.edu.sa> wrote: > ST_Crosses(geometry g1, geometry g2); > > but I want g1 to be column of points and g2 a column of geometry, so how can > I convert them to geometry enable to use the function
By column of "points", do you mean a PostGIS type, or a PostgreSQL type[1]? If it is a PostGIS type, then it is a geometry, with it's own internal type (Point, MultiPoint, Polygon, etc.). > select r.name,u.id from river r, users u where > ST_Crosses(r.point,u.polygon)='T' ; ST_Crosses returns T/F, so you don't need to evaluate " ='T' ". -Mike [1] http://www.postgresql.org/docs/current/static/datatype-geometric.html _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
