how do i get differences between rows

From: teknokrat <teknokrat(at)yahoo(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: how do i get differences between rows
Date: 2003-12-18 12:21:35
Message-ID: brs64d$1u47$1@news.hub.org
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I am after an sql query that can give the differnces between consecutive
timestamp values in the resultset.
anyone know how to do this?

thanks

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