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
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