Re: default ordering of query result - are they always guarantee

On Thu, May 20, 2010 at 8:11 AM, Igor Neyman <ineyman@perceptron.com> wrote:
>
>
>> -----Original Message-----
>> From: Scott Marlowe [mailto:scott.marlowe@gmail.com]
>> Sent: Wednesday, May 19, 2010 4:15 AM
>> To: A. Kretschmer
>> Cc: pgsql-general@postgresql.org
>> Subject: Re: default ordering of query result - are they
>> always guarantee
>>
>> ...................................
>> ...................................
>>
>> Just for reference I once had three separate oracle dbas
>> saying my pg server was broken because group by came out in
>> random order (due to hash aggregates).
>>
>
> Must be not very good dbas :)
> Oracle never guaranteed that "GROUP BY" returns sorted results.
> It's just happened that in earlier Oracle versions they were sorted due
> to algorithm being used for GROUP BY.
> But again, Oracle never guaranteed it.

Actually they were pretty good, but this was several years ago, and
they only had experience with Oracle 8, 9 was all shiny and new to
them.  And they had the typical "If Oracle does X, it must be the way
things should be everywhere" Oracle DBA attitude.