From: Mark Stosberg <mark@summersault.com>
To: pgsql-sql@postgresql.org
Subject: Re: A tricky sql-query...
Date: Mon, 3 Nov 2003 00:42:46 +0000 (UTC)
Message-ID: <slrnbqb94a.2417.mark@tanagra.summersault.com> (raw)
References: <bn6uhi$jp3$1@news.hub.org>
On 2003-10-22, Timo <siroco@suomi24.fi> wrote:
>
> You can't have any recursion in an pure sql-query, can you?
It depends on how you think of recursion, I'd say. You join on the same
table a number of times, by giving it a different alias each time. You
have to manually specify (or generate with application code) all these
aliases and joins, though. Sometimes people use this technique to
implement tree structures in SQL.
Mark
--
http://mark.stosberg.com/
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Subject: Re: A tricky sql-query...
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