Re: [GRASS-user] Advanced SQL Queries
On 12/06/12 23:21, Rich Shepard wrote: Two tables: 'sites' contains the ID and geographic coordinates; 'waterchem' contains the ID and water chemistry data. The latter table is a sub-set of the former. I want to display only those sites for which chemistry data are available. In postgres I write, SELECT DISTINCT(w.site) FROM waterchem AS w WHERE EXISTS (SELECT s.name FROM sites AS s WHERE w.site = s.name); Can I submit this same query within GRASS and have the returned sites displayed by location? If so, is there a preferred method for doing so? Just use everything after the first WHERE as argument for the 'where' parameter of d.vect (or any other module with a where parameter). Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Advanced SQL Queries
On Wed, 13 Jun 2012, Moritz Lennert wrote: Just use everything after the first WHERE as argument for the 'where' parameter of d.vect (or any other module with a where parameter). Moritz, Thank you. Rich ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Advanced SQL Queries
On 06/13/2012 03:28 PM, Moritz Lennert wrote: On 12/06/12 23:21, Rich Shepard wrote: Two tables: 'sites' contains the ID and geographic coordinates; 'waterchem' contains the ID and water chemistry data. The latter table is a sub-set of the former. I want to display only those sites for which chemistry data are available. In postgres I write, SELECT DISTINCT(w.site) FROM waterchem AS w WHERE EXISTS (SELECT s.name FROM sites AS s WHERE w.site = s.name); Can I submit this same query within GRASS and have the returned sites displayed by location? If so, is there a preferred method for doing so? Just use everything after the first WHERE as argument for the 'where' parameter of d.vect (or any other module with a where parameter). Sorry to butt in... Can you have a where="" argument that references a table other than the actual vector map's table? I tried with i.e. v.extract (to select records from a vector based on a related column in another, separate table, and I wasn't successful. ? Is there any way to connect a vector map to a PG view ? Thanks, Micha Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was received via Mail-SeCure System. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Advanced SQL Queries
Two tables: 'sites' contains the ID and geographic coordinates; 'waterchem' contains the ID and water chemistry data. The latter table is a sub-set of the former. I want to display only those sites for which chemistry data are available. In postgres I write, SELECT DISTINCT(w.site) FROM waterchem AS w WHERE EXISTS (SELECT s.name FROM sites AS s WHERE w.site = s.name); Can I submit this same query within GRASS and have the returned sites displayed by location? If so, is there a preferred method for doing so? Rich ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
