Re: bug in 9.2.2 ? subquery accepts wrong column name : upd

[Tom Lane]

Achilleas Mantzios <ach...@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


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