Subject: group by not returning sorted rows
From: Bret Hughes <bhughes@elevating.com>
To: pgsql-sql@postgresql.org
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Date: 05 Apr 2004 16:55:42 -0500
Message-Id: <1081202143.18380.117.camel@bretsony>
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I have a query:


select cities.name as city, buildings.name as building, 
	pagename, 
	log_date , 
	sum(exhibition_count) as tot 
from logrecords 
	join cities on (logrecords.city=cities.num) 
	join buildings on (logrecords.building=buildings.num) 
where 	advertiser = 'Nielsens' and 
	log_date >= '01/01/2004' and 
	log_date <= '01/31/2004' 
group by cities.name, buildings.name,pagename,log_date ;

I have migrated a database from a redhat 7.3 box running 
[bhughes@compaq3 reports]$ rpm -q postgresql
postgresql-7.2.3-5.73


To a redhat 9 box running :
[bhughes@compaq2 reports]$ rpm -q postgresql
postgresql-7.4.2-1PGDG

and the rows resulting from the query are no longer sorted by log date. 
Is this a change since 7.2x?

I can achieve the results I need by adding an order by clause identical
to the group by but this seems counter intuitive since the rows have to
be ordered anyway.

Any tips appreciated.

Bret