Re: [SQL] aggregate reverse

[Marcin Krawczyk]

Yes, you got me well. That's exactly what I was trying to achieve. Thank
you.


2008/2/1, Pavel Stehule <[EMAIL PROTECTED]>:
>
> Hello
>
> I am not sure if I understand well.
>
> On 01/02/2008, Marcin Krawczyk <[EMAIL PROTECTED]> wrote:
> > Hi all. I wolud like to know whether it is possible to reverse the
> behaviour
> > of an aggregate? Say I have a string '1,2,3,4'. Is there a way to split
> > those values to records?
>
> create or replace function unpack(anyarray)
> returns setof anyelement as $$
> select $1[i]
>from generate_series(array_lower($1,1), array_upper($1,1)) g(i)
> $$ language sql immutable;
>
> select * from unpack(string_to_array('1,2,3,4',','));
> unpack
> 
> 1
> 2
> 3
> 4
> (4 rows)
>
> Regards
> Pavel
>
>
> >
> > Regards and thanks in advance.
> >  mk
> >
>

Re: [SQL] aggregate reverse

[Pavel Stehule]

Hello

I am not sure if I understand well.

On 01/02/2008, Marcin Krawczyk <[EMAIL PROTECTED]> wrote:
> Hi all. I wolud like to know whether it is possible to reverse the behaviour
> of an aggregate? Say I have a string '1,2,3,4'. Is there a way to split
> those values to records?

create or replace function unpack(anyarray)
returns setof anyelement as $$
select $1[i]
   from generate_series(array_lower($1,1), array_upper($1,1)) g(i)
$$ language sql immutable;

select * from unpack(string_to_array('1,2,3,4',','));
 unpack

 1
 2
 3
 4
(4 rows)

Regards
Pavel


>
> Regards and thanks in advance.
>  mk
>

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