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Date: Mon, 10 Feb 2003 10:14:15 -0800 (PST)
From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: <john@flowlabs.com>
Cc: <pgsql-sql@postgresql.org>
Subject: Re: problems with date and interval queries.
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On Mon, 10 Feb 2003 john@flowlabs.com wrote:

> I am having problems adding an interval to a date in a select statement
> where the interval is specified as a selected column. Is this possible?
> Below is an example of the query that I'm executing. The query gives and
> error at the num_min column in the outer query. It works fine if that is
> replaced with the text '90 minutes'. Thank you in advance for all help
> provided.

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)