get difference between two timestamp value in second?

From: "Sergiy Ovcharuk" <Sergey(dot)Ovcharuk(at)tessart(dot)kiev(dot)ua>
To: pgsql-hackers(at)postgresql(dot)org
Subject: get difference between two timestamp value in second?
Date: 2001-04-18 17:43:38
Message-ID: 9bkjpe$7vf$1@news.lucky.net
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Hello Group!
Does anybody knows how I can get the difference between two date (timestamp)
is secondes or convert timestamp to integer or float type (in any acceptable
sense).

Thank you in advance,
Sergiy.

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