On Mon, Mar 24, 2014 at 8:47 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Ilya Ivanov <forn@ngs.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.
