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Message-ID: <3ce9822f0707240040o2f358155p7ff7537bbe986209@mail.gmail.com>
Date: Tue, 24 Jul 2007 09:40:43 +0200
From: "Valentine Gogichashvili" <valgog@gmail.com>
To: "andrew@pillette.com" <andrew@pillette.com>
Subject: Re: multicolumn index column order
Cc: pgsql-performance@postgresql.org
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On 7/24/07, andrew@pillette.com <andrew@pillette.com> wrote:
>
> valgog <valgog@gmail.com> wrote ..
> > On Jul 23, 7:00 pm, t...@sss.pgh.pa.us (Tom Lane) wrote:
> > > valgog <val...@gmail.com> writes:
> > > > how to build an multicolumn index with one column order ASCENDING
> and
> > > > another column order DESCENDING?
> > >
> > > Use 8.3 ;-)
> > >
> > > In existing releases you could fake it with a custom reverse-sorting
> > > operator class, but it's a pain in the neck to create one.
>
> I've often gotten what I want by using a calculated index on (f1, -f2).
> ORDER BY will take an expression, e.g. ORDER BY f1, -f2. Simpler than a
> custom operator.
>


Yes, this is true, but I do now know how to make text order be reversible?
There is no - (minus) operator for text value. By now it is not a problem
for me, but theoretically I do not see other chance to reverse text fields
order...

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On 7/24/07, <b class="gmail_sendername"><a href="mailto:andrew@pillette.com">andrew@pillette.com</a></b> &lt;<a href="mailto:andrew@pillette.com">andrew@pillette.com</a>&gt; wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
valgog &lt;<a href="mailto:valgog@gmail.com">valgog@gmail.com</a>&gt; wrote ..<br>&gt; On Jul 23, 7:00 pm, <a href="mailto:t...@sss.pgh.pa.us">t...@sss.pgh.pa.us</a> (Tom Lane) wrote:<br>&gt; &gt; valgog &lt;<a href="mailto:val...@gmail.com">
val...@gmail.com</a>&gt; writes:<br>&gt; &gt; &gt; how to build an multicolumn index with one column order ASCENDING and<br>&gt; &gt; &gt; another column order DESCENDING?<br>&gt; &gt;<br>&gt; &gt; Use 8.3 ;-)<br>&gt; &gt;
<br>&gt; &gt; In existing releases you could fake it with a custom reverse-sorting<br>&gt; &gt; operator class, but it&#39;s a pain in the neck to create one.<br><br>I&#39;ve often gotten what I want by using a calculated index on (f1, -f2). ORDER BY will take an expression, 
e.g. ORDER BY f1, -f2. Simpler than a custom operator.<br></blockquote></div><br><br>Yes, this is true, but I do now know how to make text order be reversible? There is no - (minus) operator for text value. By now it is not a problem for me, but theoretically I do not see other chance to reverse text fields order... 
<br><br>

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