| From: | Marti Raudsepp <marti(at)juffo(dot)org> |
|---|---|
| To: | Steve Crawford <scrawford(at)pinpointresearch(dot)com> |
| Cc: | Bob Pawley <rjpawley(at)shaw(dot)ca>, Postgresql <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Arrays |
| Date: | 2011-09-17 03:11:48 |
| Message-ID: | CABRT9RBDRgPYRvpek44EVH1-+efnVoGHVCKJ-mzD=S5idEPfKA@mail.gmail.com |
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| Lists: | pgsql-general |
On Wed, Sep 14, 2011 at 21:05, Fabrízio de Royes Mello
<fabriziomello(at)gmail(dot)com> wrote:
> postgres(at)bdteste=# SELECT array_upper(ARRAY['foo', 'bar'], 1);
On Wed, Sep 14, 2011 at 21:09, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
> select count(*) from unnest(_array_);
On Wed, Sep 14, 2011 at 21:15, Steve Crawford
<scrawford(at)pinpointresearch(dot)com> wrote:
> Look at array_dims, array_upper and array_lower.
Huh, what's up with people suggesting overcomplicated solutions?
Just use the one function that's designed to do this: array_length(arr, 1)
Note that for an empty array, this will return NULL. If you want to
get 0 instead, use:
coalesce(array_length(arr, 1), 0)
Note that, for multidimensional arrays, this returns the length of the
1st dimension (hence 1 in arguments)
Regards,
Marti
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