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Date: Wed, 13 Jun 2007 14:48:47 -0400
From: Bob Singleton <bsingleton@ibss.net>
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To: =?ISO-8859-1?Q?Rodrigo_De_Le=F3n?= <rdeleonp@gmail.com>
CC: pgsql-sql@postgresql.org
Subject: Re: calculate time diffs across rows with single timestamp
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	<1181753515.419178.63440@j4g2000prf.googlegroups.com>
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Rodrigo De Le&oacute;n wrote:
<blockquote
 cite="mid1181753515.419178.63440@j4g2000prf.googlegroups.com"
 type="cite">
  <pre wrap="">On Jun 13, 11:17 am, <a class="moz-txt-link-abbreviated" href="mailto:bsingle...@ibss.net">bsingle...@ibss.net</a> (Bob Singleton) wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">Any suggestions on how I can build a result set that would return

ASSET 001 AAA 1:00 (1 hour)
ASSET 001 BBB 0:10 (10 minutes)
ASSET 001 CCC 0:08 (8 minutes)
ASSET 001 DDD {difference between timestamp and now()}
ASSET 002 AAA 0:03 (3 minutes)
ASSET 002 BBB {difference detween timestamp and now()}
ASSET 003 AAA{diff between timestamp and now()}
    </pre>
  </blockquote>
  <pre wrap=""><!---->
SELECT
TYPE, ID, STATUS
, (COALESCE(
	(SELECT MIN(DATETIME) FROM STATUSLOG
	WHERE TYPE = S.TYPE AND ID = S.ID AND DATETIME &gt; S.DATETIME)
	, NOW()::TIMESTAMP
	) - DATETIME) AS DURATION
FROM STATUSLOG S
ORDER BY TYPE, ID, STATUS


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TIP 6: explain analyze is your friend

  </pre>
</blockquote>
Awesome - thank you very much! Slightly modified to collapse by TYPE /
ID / STATUS<br>
<br>
<pre wrap="">SELECT
TYPE, ID, STATUS, SUM(
    (COALESCE(
	(SELECT MIN(DATETIME) FROM STATUSLOG
	WHERE TYPE = S.TYPE AND ID = S.ID AND DATETIME &gt; S.DATETIME)
	, NOW()::TIMESTAMP
	) - DATETIME))
FROM STATUSLOG S
ORDER BY TYPE, ID, STATUS

Thanks for the lesson!

Bob Singleton
</pre>
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