select "Id","Country","State/Provence" from (select g.geo_id as "Id", g.geo_name as "Country", gTo.geo_name as "State/Provence" from geo g,geo gTo, geo_assoc ga where ga.geo_id = g.geo_id and ga.geo_id_to = gTo.geo_id and g.geo_id IN (select geo_id from geo where geo_type_id='COUNTRY') and g.geo_id = 'USA' union select g.geo_id as "Id", g.geo_name as "Country", '' as "State/Provence" from geo g LEFT OUTER JOIN geo_assoc ga on g.geo_id = ga.geo_id where g.geo_type_id='COUNTRY' and ga.geo_id is null) as GeoList where "Id" ='USA' order by "State/Provence";
or alternate without camel case select id,country,state from (select g.geo_id as "id", g.geo_name as "country", gTo.geo_name as "state" from geo g,geo gTo, geo_assoc ga where ga.geo_id = g.geo_id and ga.geo_id_to = gTo.geo_id and g.geo_id IN (select geo_id from geo where geo_type_id='COUNTRY') union select g.geo_id as "id", g.geo_name as "country", '' as "state" from geo g LEFT OUTER JOIN geo_assoc ga on g.geo_id = ga.geo_id where g.geo_type_id='COUNTRY' and ga.geo_id is null) as GeoList where "id" ='USA' order by state;
both work
Again my thanks,
Tom
From: Bartosz Dmytrak <bdmytrak@gmail.com> To: Tom Burns <tramseyburns@yahoo.com> Cc: "pgsql-novice@postgresql.org" <pgsql-novice@postgresql.org> Sent: Sunday, July 15, 2012 2:41 PM Subject: Re: [NOVICE] Selecting Fields in Union in Subquery
I can no figure out the syntax for directly addressing fields (for example 'order by StateProvence" or "order by gTo.geo_name" instead of order by 3)
This should work ("StateProvence" not gTo.geo_name), but You should remember to use " (quotation mark) when You use camel cased names. If not PG will treat fields names like written in small letters.
You should do something like this:
order by "StateProvence"
not
order by StateProvence
I would like to be able to filter and sort the sub-query in the parent query.
I don't get it, I assume You would like to sort/filter sub-query result in parent query. Then You should remember to use names of sub-query result columns i.e
gTo.geo_name is not visilbe, but geolist."StateProvence" is visible outside sub query