From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: bug in 9.2.2 ? subquery accepts wrong column name : upd |
Date: | 2013-03-14 16:17:46 |
Message-ID: | 17320.1363277866@sss.pgh.pa.us |
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Lists: | pgsql-sql |
Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> writes:
> dynacom=# SELECT DISTINCT ON (qry.setid) qry.setid, qry.arragg[1:2] FROM
> (select distinct sst.setid,(array_agg(vsl.name) OVER (PARTITION BY sst.setid ORDER BY character_length(vsl.name))) as arragg
> FROM sissets sst, vessels vsl WHERE vsl.id=sst.vslid ORDER BY sst.setid) as qry
> WHERE array_length(qry.arragg,1)>1 AND qry.setid IN (SELECT setid from sis_oper_cons) ORDER BY qry.setid,array_length(qry.arragg,1);
> [ works ]
> however, there is not column setid in sis_oper_cons,
If not, that's a perfectly legal outer reference to qry.setid.
Probably not one of SQL's better design features, since it confuses
people regularly; but it's required by spec to work like that.
regards, tom lane
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