Excerpts from John Gage's message of mar ago 03 16:21:58 -0400 2010:

> Grouping by summing numerical fields seems to be straightforward, but  
> grouping by concatenating text fields escapes my search of the  
> documentation.

You can create a new custom aggregate function that does this.  It's
pretty straightforward.  There are examples in the archives (search for
text_concat), but there's also a more modern way involving array_agg and
array_to_string.

-- 
Álvaro Herrera <alvhe...@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
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