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Message-ID: <475B159D.8000203@mark.mielke.cc>
Date: Sat, 08 Dec 2007 17:07:25 -0500
From: Mark Mielke <mark@mark.mielke.cc>
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To: Tom Lane <tgl@sss.pgh.pa.us>
CC: pgsql-performance@postgresql.org
Subject: Re: Combining two bitmap scans out performs a single regular
	index scan?
References: <475AD1E8.7000304@mark.mielke.cc> <15505.1197146779@sss.pgh.pa.us>
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Tom Lane wrote:
> Mark Mielke <mark@mark.mielke.cc> writes:
>   
>> To find records after a certain time, I must do one of:
>>     select * from icpric where audtdate > ? or (audtdate = ? and 
>> audttime > ?)
>>     
> In recent releases (at least 8.2, don't remember about 8.1), a row
> comparison is what you want:
>
> 	WHERE (auddate, adttime) > (?, ?)
>   
Cool! That's the ticket. :-)

I guess it would be unnecessary to translate the other two queries into 
this one for the purpose of planning, eh? :-)

Cheers,
mark

-- 
Mark Mielke <mark@mielke.cc>


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Tom Lane wrote:
<blockquote cite="mid:15505.1197146779@sss.pgh.pa.us" type="cite">
  <pre wrap="">Mark Mielke <a class="moz-txt-link-rfc2396E" href="mailto:mark@mark.mielke.cc">&lt;mark@mark.mielke.cc&gt;</a> writes:
  </pre>
  <blockquote type="cite">
    <pre wrap="">To find records after a certain time, I must do one of:
    select * from icpric where audtdate &gt; ? or (audtdate = ? and 
audttime &gt; ?)
    </pre>
  </blockquote>
  <pre wrap=""><!---->In recent releases (at least 8.2, don't remember about 8.1), a row
comparison is what you want:

	WHERE (auddate, adttime) &gt; (?, ?)
  </pre>
</blockquote>
Cool! That's the ticket. :-)<br>
<br>
I guess it would be unnecessary to translate the other two queries into
this one for the purpose of planning, eh? :-)<br>
<br>
Cheers,<br>
mark<br>
<pre class="moz-signature" cols="72">-- 
Mark Mielke <a class="moz-txt-link-rfc2396E" href="mailto:mark@mielke.cc">&lt;mark@mielke.cc&gt;</a>
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