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How do I specify intervals in functions?

From: "Rob Richardson" <Rob(dot)Richardson(at)rad-con(dot)com>
To: <pgsql-general(at)postgresql(dot)org>
Subject: How do I specify intervals in functions?
Date: 2008-07-31 12:36:37
Message-ID: 04A6DB42D2BA534FAC77B90562A6A03D9A2261@server.rad-con.local (view raw, whole thread or download thread mbox)
Lists: pgsql-general
In the help file under date and time functions, I see that intervals can
be specified as "interval '3 hours' ".  In a PgAdmin SQL window, I can
enter "select interval '3 hours' ", and it will return me "03:00:00", as
expected.  I can also enter "select '3 hours'::interval", and get the
same result.  Yet neither syntax works inside a function.  
     ThreeHours interval;
     ThreeHours = interval '3 hours';  -- throws a syntax error
     ThreeHours = '3 hours'::interval; -- also throws a syntax error
So how do I specify an interval in a function?
Specifically, I'm trying to do something like the following:
    if NewRevisionTime < PredictedEndTime - '08:00:00'::interval then
Since both of the shown forms give syntax errors, how do I subtract
eight hours from a time???
Thank you very much.
RobR, who posted this on the novice list but got no answers.


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Subject: Re: How do I specify intervals in functions?
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