RE: HASH GROUP BY
- From: "Elliott, Patrick" <patrick.elliott@xxxxxxxxxxxxx>
- To: Jared Still <jkstill@xxxxxxxxx>
- Date: Wed, 23 Apr 2008 15:40:52 -0500
That is correct. My point is that what Rob is calling wrong results is
actually just unexpected results based on invalid assumptions.
Pat
________________________________
From: Jared Still [mailto:jkstill@xxxxxxxxx]
Sent: Wednesday, April 23, 2008 3:34 PM
To: Elliott, Patrick
Cc: Rob.Dempsey@xxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: HASH GROUP BY
On Wed, Apr 23, 2008 at 12:20 PM, Elliott, Patrick
<patrick.elliott@xxxxxxxxxxxxx<mailto:patrick.elliott@xxxxxxxxxxxxx>> wrote:
Now I understand what you mean by buggy. It no longer sorts the rows. If you
have code that relies on a group by being in sorted order, then the code will
no longer work. If you have had to disable this in the past to get correct
results, then you will need to continue disabling it indefinitely. The only
way to fix it and reenable the hashing group by is to change the code.
GROUP BY has never been documented to provide rows in sorted order.
From the docs:
The GROUP BY clause groups rows but does not guarantee the order of the result
set. To order the groupings, use the ORDER BY clause.
--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
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