Re: Regexp matching + typecasts

Thanks Tom, that worked!

On Mon, Mar 24, 2014 at 8:47 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Ilya Ivanov <forn(at)ngs(dot)ru> writes:
> > I need to find all active (status=0) items not belonging to any active
> > trigger. The best I could come up with is this:
>
> > select count(itemid) from items where status='0' and itemid not in
> (select
> > cast(regexp_matches(expression,'{([^}]+)}','g') as integer) from triggers
> > where status='0');
>
> > However, the cast doesn't work:
> > ERROR: cannot cast type text[] to integer
>
> Well, yeah. You need to convert the possibly-multiple match results into
> a set. Try putting unnest() around the regexp_matches call.
>
> regards, tom lane
>

--
Ilya.