Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #19330 > unrolled thread

Re: [GENERAL] [RFE] auto ORDER BY for SELECT

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [GENERAL] [RFE] auto ORDER BY for SELECT Chris Angelico <rosuav@gmail.com> - 2012-01-24 19:30 +1100

#19330 — Re: [GENERAL] [RFE] auto ORDER BY for SELECT

Whoooooops. Wrong list. *sigh* At least there's some variety - it's
not Savoynet this time.

Disregard the mad guy in the corner, he's not saying anything useful anyway...

ChrisA

On Tue, Jan 24, 2012 at 7:29 PM, Chris Angelico <rosuav@gmail.com> wrote:
> On Mon, Jan 23, 2012 at 11:17 PM, Douglas Eric <sekkuar@hotmail.com> wrote:
>> I suggest to change this behavior. If one makes a SELECT statement without
>> any ORDER BY, it would be
>> clever to automatically sort by the first primary key found in the query, if
>> any.
>> The present behavior would still be used in case of queries without any
>> primary key fields.
>
> This would require that work be done without text commanding it, which
> is IMHO a bad idea. Generally, SQL follows the principle that more
> text --> more work: compare SELECT and SELECT DISTINCT (it's more work
> to look for duplicates), VACUUM and VACUUM ANALYZE, etc, etc. The
> default state is to do the least work that makes sense. (There are
> exceptions - UNION ought to be UNION DISTINCT, versus UNION ALL to
> reduce the work done - but this is the general rule.)
>
> Often, a query is done with genuine disregard for order. If you're
> going to take the results of the query and stuff them into a
> hashtable, you don't care what order they come up in. Why have the
> database sort them? Let 'em come in the easiest order possible.
>
> ChrisA

[toc] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web