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To: "Campbell, Lance" <lance@illinois.edu>
cc: pgsql-sql@postgresql.org
Subject: Re: subtract two dates to get the number of days 
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Comments: In-reply-to "Campbell, Lance" <lance@illinois.edu>
	message dated "Tue, 13 Jul 2010 09:58:53 -0500"
Date: Tue, 13 Jul 2010 11:02:10 -0400
Message-ID: <29026.1279033330@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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"Campbell, Lance" <lance@illinois.edu> writes:
> I want to subtract to dates to know the number of days different.
> Example:
> 01/02/2010 - 01/01/2010 = 1 day
> 08/01/2010 - 07/31/2010 = 1 day
> How do I do this? 

If they're dates, you just subtract.

regression=# select '08/01/2010'::date - '07/31/2010'::date;
 ?column? 
----------
        1
(1 row)


			regards, tom lane