David Fetter wrote:
>On Mon, Sep 05, 2005 at 03:00:30AM +0300, Sterpu Victor wrote:
>
>
>>Can I do something like this?
>>SELECT sum(name) FROM table;
>>
>>Where name is a text field.
>>I know 'sum' doesn't work, but is there another solution?
>>'||' is not good because it will take just 2 arguments.
>>
>>
>
>Currently, you can use a custom aggregate like array_accum()
>http://www.postgresql.org/docs/current/static/xaggr.html
>
>combined with the array_to_string() like this:
>
>SELECT array_to_string(array_accum(email), ', ') AS "emails"
>FROM person_email;
>
>
>
Check out the "User Comments" at
http://www.postgresql.org/docs/8.0/interactive/sql-createaggregate.html
There are a couple good suggestions there that don't deal with arrays.