From: Lane Van Ingen <lvaningen@esncc.com>
To: pgsql-sql@postgresql.org
Subject: Can EXCEPT Be Used for To Solve This Problem?
Date: Wed, 24 Aug 2005 16:47:16 -0400
Message-ID: <EKEMKEFLOMKDDLIALABIMEMGCBAA.lvaningen@esncc.com> (raw)
Given the following data in a table named 'foo' :
id update_time description
2 2005-08-24 00:10:00 transaction1
2 2005-08-24 00:22:00 transaction2
2 2005-08-24 00:34:00 transaction3
2 2005-08-24 00:58:00 transaction4
I want to select 2nd oldest transaction from foo (transaction 3). The
solution below
works, but I think there may be a better way. Does anyone else have a better
idea?
select * from foo f1
join
(select id, update_time
from foo
except
select id, max(update_time) as update_time
from foo
group by id) f2
using (id, update_time)
order by 1, 2 desc limit 1;
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To: pgsql-sql@postgresql.org
Cc: lvaningen@esncc.com
Subject: Re: Can EXCEPT Be Used for To Solve This Problem?
In-Reply-To: <EKEMKEFLOMKDDLIALABIMEMGCBAA.lvaningen@esncc.com>
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