From: Jeff Boes <jboes@nexcerpt.com>
To: pgsql-sql@postgresql.org
Subject: Quartile (etc) ranking in a SQL statement?
Date: Thu, 07 Nov 2002 13:16:44 -0500
Message-ID: <aqeajg$pg2$1@news.hub.org> (raw)
Here's a puzzler:
Given a query that returns rows ranked by some criteria, how can I write
another query around it that will give me the (say) first quartile (top
25%)? Another way of putting it is: if I have rows that look like this:
aaa | 1251
aba | 1197
cax | 1042
... | ...
axq | 23
(142 rows)
How can I write a query that will return these as
1 | aaa | 1251
2 | aba | 1197
3 | cax | 1042
... | ... | ...
142 | axq | 23
--
Jeff Boes vox 616.226.9550 ext 24
Database Engineer fax 616.349.9076
Nexcerpt, Inc. http://www.nexcerpt.com
...Nexcerpt... Extend your Expertise
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To: pgsql-sql@postgresql.org
Cc: jboes@nexcerpt.com
Subject: Re: Quartile (etc) ranking in a SQL statement?
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