Achilleas Mantzios <[email protected]> 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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