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Date: Mon, 10 Feb 2003 11:03:43 -0800 (PST)
From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: <john@flowlabs.com>, <pgsql-sql@postgresql.org>
Subject: Re: problems with date and interval queries. 
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On Mon, 10 Feb 2003, Tom Lane wrote:

> Stephan Szabo <sszabo@megazone23.bigpanda.com> writes:
> > interval <stuff> is the form for an interval literal.  If the column is
> > already an interval, you probably don't need it at all.  If you need to
> > cast it you should do a cast CAST (num_min AS INTERVAL)
>
> I don't believe there is a cast from any numeric type to interval.

Yeah, but I think he was making an interval string in the subselect,
something like '27 minutes'.

> I'd recommend the interval-times-float operator.  It should work to
> write
>
> 	num_min * interval '1 min'
>
> This approach has the advantage that it trivially adapts to whatever
> unit you happen to have the column stated in (seconds, minutes, days, ...)

That's better in any case though :)