From: Koen Bok <koen@madebysofa.com>
To: pgsql-sql@postgresql.org
Subject: Simple Query?
Date: Tue, 11 Sep 2007 23:27:19 +0200
Message-ID: <2C0EA394-5AC8-4FC8-99F3-5FAEE9720360@madebysofa.com> (raw)
I am doing some optimization on our search, but I need some advise...
table: item
id name
--------------------------------------
1 iPod
2 Zune
3 Walkman
table: search_item
id_search id_item
--------------------------------------
1 1
1 2
1 3
2 2
2 3
3 1
3 3
Now what I want to have is the items that match with id_search 1 and
2 and 3. Therefore I use the following SQL query.
SELECT * FROM item WHERE id IN
(SELECT id_item FROM search_item WHERE id_search=1 AND id_item IN
(SELECT id_item FROM search_item WHERE id_search=2 AND id_item IN
(SELECT id_item FROM search_item WHERE id_search=3)));
This should only return id_item 3. Would this be the best SQL query
to get this result? I have the feeling there should be something
better, but I cannot find it. Anyone has a hint?
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To: pgsql-sql@postgresql.org
Cc: koen@madebysofa.com
Subject: Re: Simple Query?
In-Reply-To: <2C0EA394-5AC8-4FC8-99F3-5FAEE9720360@madebysofa.com>
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