From: Dan Langille <dan@langille.org>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-sql@postgresql.org
Subject: Re: using LIMIT only on primary table
Date: Sat, 2 Mar 2002 18:40:19 -0500
Message-ID: <200203022340.g22NeNk56386@lists.unixathome.org> (raw)
In-Reply-To: <17340.1015111355@sss.pgh.pa.us>
References: <200203022235.g22MZYk55756@lists.unixathome.org>
On 2 Mar 2002 at 18:22, Tom Lane wrote:
> "Dan Langille" <dan@langille.org> writes:
> > If I want all the items on the last 100 orders, I'd start like this:
>
> > SELECT *
> > from orders, order_items
> > where order_items.order_id = orders.id
> > LIMIT 100
>
> I think you want
>
> SELECT *
> from
> (SELECT * from orders order by ID DESC limit 100) as recent_orders,
> order_items
> where order_items.order_id = recent_orders.id
That is it Tom. Thank you. As soon as I saw your solution, I thought of
creating a view to do this.
CREATE VIEW recent orders AS
SELECT * from orders
order by ID DESC
limit 100;
Which makes the query:
SELECT *
from recent_orders, order_items
where order_items.order_id = recent_orders.id
Cheers
--
Dan Langille
The FreeBSD Diary - http://freebsddiary.org/ - practical examples
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To: pgsql-sql@postgresql.org
Cc: dan@langille.org, tgl@sss.pgh.pa.us
Subject: Re: using LIMIT only on primary table
In-Reply-To: <200203022340.g22NeNk56386@lists.unixathome.org>
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