From: Dan Langille <dan@langille.org>
To: pgsql-sql@postgresql.org
Subject: using LIMIT only on primary table
Date: Sat, 2 Mar 2002 17:35:31 -0500
Message-ID: <200203022235.g22MZYk55756@lists.unixathome.org> (raw)
If I want the last 100 orders:
SELECT * FROM orders LIMIT 100;
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
But that will only give me the last 100 items, not 100 orders.
What I really want is
SELECT *
from orders, order_items
where order_items.order_id = orders.id
and exists
(SELECT * from orders order by ID DESC limit 100);
But that gives me all orders, not just the first 100.
Adding a LIMIT 100 to the above doesn't work either. It equates to the
first example.
Clues? cheers
--
Dan Langille
The FreeBSD Diary - http://freebsddiary.org/ - practical examples
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To: pgsql-sql@postgresql.org
Cc: dan@langille.org
Subject: Re: using LIMIT only on primary table
In-Reply-To: <200203022235.g22MZYk55756@lists.unixathome.org>
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