From: Dan Langille <dan@langille.org>
To: Jean-Luc Lachance <jllachan@nsd.ca>
Cc: Dan Langille <dan@langille.org>
Cc: pgsql-sql@postgresql.org
Subject: Re:
Date: Mon, 29 Sep 2003 17:19:04 -0400
Message-ID: <3F786988.30024.356FBB90@localhost> (raw)
In-Reply-To: <3F783BD8.48101D85@nsd.ca>
On 29 Sep 2003 at 10:04, Jean-Luc Lachance wrote:
> Wouldn't:
>
> insert into r
> select count(*)
> from users
> where date( lastlogin) > current_date - MaxDays * interval '' 1 day''
> group by date( lastlogin);
>
> be more efficient?
Yes it would, by a factor of 5.
P.S. but it would not show dates for which there are no logins. The
above can return zero rows. The previous example always returns
MaxDays rows.
--
Dan Langille : http://www.langille.org/
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To: pgsql-sql@postgresql.org
Cc: dan@langille.org, jllachan@nsd.ca
Subject: Re:
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