Hi Pietro,
what I do in similar cases (creating Views, not sure if it works with
SQL layer) is:
SELECT min(my_pk_column), ST_Union(ST_Buffer(geom,500) as geom FROM
public.mytable
Bernhard
Am 07.11.2012 08:38, schrieb Pietro Rossin:
Hi all
I tried to load in Qgis, by using fast SQL layer, a query like this:
SELECT (select ST_Union(ST_Buffer(geom,500)) FROM public.mytable) as geom;
This query make a buffer of the features in mytable and union them in a
single polygon (if contiguous).
It works in pgadmin and in openjump but not in Qgis, because Qgis need a
unique value (integer) column coming from the query.
Of course I can make a SELECT INTO mynewtable adding a serial field "gid",
but if I have a lot of steps to perform my spatial analysis I fill my db
with a lot of temp data.
So, is there some way to make a "volatile" integer unique field in the above
query so Qgis will be happy with it ;-)?
I'm using Qgis 1.8 Postgis 2
Thanks
Pietro
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Bernhard Ströbl
Anwendungsbetreuer GIS
Kommunale Immobilien Jena
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