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
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