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
