On 9/20/05, Matthew Peter <survivedsushi@yahoo.com> wrote:
> Wondering if there's a way for postgres to return how
> many elements are in a array as a single integer? For
> instance, returning 10 (items in array) instead of
> [-5:4]
>
> Also, is there a way to return the position of an item
> in a array?
>
Try using array_upper and specify which array dimension.
from http://www.postgresql.org/docs/current/static/arrays.htm:
"array_dims produces a text result, which is convenient for people to
read but perhaps not so convenient for programs. Dimensions can also
be retrieved with array_upper and array_lower, which return the upper
and lower bound of a specified array dimension, respectively."
pg8=# SELECT array_dims('{4,2,3,5,6}'::INT[]);
array_dims
------------
[1:5]
(1 row)
pg8=# SELECT array_upper('{4,2,3,5,6}'::INT[],1);
array_upper
-------------
5
