Re: pl/pgsql recursion/arrays (fwd)

On Tue, 4 Sep 2001, Bo Lorentsen wrote:

> Jason Tan wrote:
>
> > Is it possible to use recursion in pl/pgsql in particular with postgres
> > 7.0xx?
>
> I hope I can tell you within a few days, as I need this too :-)
>

I can tell you right now, it works.

I have implemented a function that recurses through records that index on
each other in tree style.

Thanks for your other info too.

I think I have read all the latest offical doco, and dont recall seeing
that (SETOF) there.
:-\

Jason

> > Also is it posible to declare and use array in plpgsql?
>
> Yeps, "SETOF" is your friend.
>
> > Is it possible to somehow return a series of values?
>
> Yeps try "RETURNS SETOF INTEGER" to define an area of integers as a return
> value from a function.
>
> > eg to return muliple values somehow so that they can be used in somethign
> > like:
> > select column_name from table_name where attribute_name in (select
> > my_func(column2) from table2);
> >
> > ie so you can effectively use a function as a filter?
>
> Yeps, this works perfectly, like this :
>
>     SELECT a, b FROM c WHERE a.id IN (SELECT fn_return_setof());
>
> /BL
>

--
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Jason Tan                                                jason@rebel.net.au
     "Democracy is two wolves and a lamb voting on what to have for lunch.
                 Liberty is a well-armed lamb contesting the vote."
                               ~Benjamin Franklin, 1759
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