Hi Regina,
yes, I am :-)
Regards,
Birgit.
Obe, Regina schrieb:
Birgit,
Looks fine to me actually.
So are you saying this query generates duplicates?
select
a.gid,
a.feldblocki,
a.the_geom
from bfn.nw_inv07_oc_rep a
except
select
a.gid,
a.feldblocki,
a.the_geom
from bfn.nw_inv07_oc_rep a, bfn.nw_inv07_ol_test b
where a.gid=b.gid_inv07
limit 100;
Hope that helps,
Regina
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Birgit Laggner
Sent: Tuesday, September 23, 2008 7:42 AM
To: PostGis_Mailinglist
Subject: [postgis-users] SELECT problem
Dear list,
probably, I'm just to unexperienced to see what I'm doing wrong, but
that doesn't change that I need help :-)
I want to select a test dataset out of a bigger dataset (a). First part
of the test dataset should be the first 100 geometries of (a) which have
ids also occuring in a second dataset (b). Second part should be 100
geometries of (a) whose ids don't match with ids of (b). This is my sql
statement so far:
insert into bfn.nw_inv07_oc_rep_test
select
a.gid,
a.feldblocki,
a.the_geom
from bfn.nw_inv07_oc_rep a, bfn.nw_inv07_ol_test b
where a.gid=b.gid_inv07;
insert into bfn.nw_inv07_oc_rep_test
select
a.gid,
a.feldblocki,
a.the_geom
from bfn.nw_inv07_oc_rep a
except
select
a.gid,
a.feldblocki,
a.the_geom
from bfn.nw_inv07_oc_rep a, bfn.nw_inv07_ol_test b
where a.gid=b.gid_inv07
limit 100;
The first part of the insert works fine, but the result of the second
insert looks strange for me: some rows double or even triple, while in
the origin datasets, there are no duplicate rows.
Anybody who could explain what's happening during my query?
Thanks a lot,
Birgit.
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--
Dipl.-Geoökol. Birgit Laggner
Johann Heinrich von Thünen-Institut,
Bundesinstitut für Ländliche Räume, Wald und Fischerei
Institut für Ländliche Räume
Bundesallee 50
38116 Braunschweig
Johann Heinrich von Thünen-Institute
Federal Research Institute for Rural Areas, Forestry and Fisheries
Institute of Rural Areas
Bundesallee 50
D-38116 Braunschweig
Germany
Tel.: (0531) 596 - 5240
Fax: (0531) 596 - 5599
E-Mail: [EMAIL PROTECTED]
Internet: www.vti.bund.de
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