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From: DA Morgan <damorgan@exesolutions.com>
X-Newsgroups: comp.databases.theory, comp.databases.rdb,
	comp.databases.postgresql.sql, comp.databases.oracle.misc
Subject: Re: double linked list
Date: Tue, 28 Jan 2003 08:45:21 -0800
Organization: EXE
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Juergen wrote:

> Hi folks!,
>
> I've got a table called 'link_t' containing a collection of seller -
> buyer relations between two parties.
>
> sql> select * from link_t
>
> S B
> - -
> C X
> A B
> B C
> C D
> D E
>
> 5 rows selected.
>
> I am looking for a select statement that returns the concatenation of
> seller - buyer relations between the first seller 'A' and the last
> buyer 'B'.
>
> the result should be
>
> S B
> - -
> A B
> B C
> C D
> D E
>
> Currently I fumbling around with self joins but haven't figured out
> yet.
> Any suggestions
>
> Many tanks in advance
>
> Cheers
>
> Juergen

Look at the CONNECT BY built-in function.

Daniel Morgan