Re: bug in 9.2.2 ? subquery accepts wrong column name : upd - Mailing list pgsql-sql

Thanx Tom.

On Πεμ 14 Μαρ 2013 12:17:46 Tom Lane wrote:
> Achilleas Mantzios <achill@matrix.gatewaynet.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
>
>
>
-
Achilleas Mantzios
IT DEV
IT DEPT
Dynacom Tankers Mgmt