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From Dag.Wan...@Sun.COM (Dag H. Wanvik)
Subject Re: Recursive query on common table
Date Tue, 13 Oct 2009 02:22:17 GMT
Sylvain Leroux <sl20@wanadoo.fr> writes:

> If you use adjacency lists, recursion is the answer. But is not
> directly supported by Derby. As Rick Hillegas suggested, one solution
> would be to encapsulate the recursive part or your query in a custom
> table function (written in Java). I've never done that, so if you do,
> I would find of great benefice if you post your solution on the
> mailing list (or the wiki)!

The SQL standard has recursive queries these days (WITH RECURSIVE,
cf. SQL 2003, vol 2, section 7.13 <query expression>), sadly not
supported by Derby. Do we we have a volunteer to implement it? ;-)

Dag


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