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From: ktm@rice.edu <ktm@rice.edu>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Jason Aleski <jason.aleski@gmail.com>
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: ERROR: column "gid" specified more than once
Date: Tue, 12 May 2015 10:53:09 -0500
Message-ID: <20150512155309.GH31129@aart.rice.edu> (raw)
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On Tue, May 12, 2015 at 08:49:53AM -0700, David G. Johnston wrote:
> On Tuesday, May 12, 2015, Jason Aleski <jason.aleski@gmail.com> wrote:
> 
> > You probably need to specify your wildcard on both tables.
> >
> > CREATE TABLE "BorujerdDistCent" as
> > SELECT
> >   "Borujerd".*, "Lorestan".*,
> > t_distance(st_centroid("Lorestan".geometry),"Borujerd".geometry)/1000
> > as DistFromCntroid
> > FROM "Borujerd", "Lorestan"
> >
> >
> My bad on the assumed -bugs list from before...
> 
> Anyway, how is this suugestion different from simply saying "*" without a
> relation specification - which the OP did and it didn't work.
> 
> David J.

Because the column names are differentiated by their prefixes then:

Borujerd.gid, Lorestan.gid

No conflict.

Regards,
Ken


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