Re: A tricky sql-query...

On Sun, 2003-11-02 at 19:42, Mark Stosberg wrote:
> 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.  

Not to mention the WITH .. RECURSIVE clause, not yet in PostgreSQL.