David Garamond <[EMAIL PROTECTED]> wrote:
> We can use SUM(), AVG(), COUNT(), etc. in GROUP clause. These are all
> numeric functions. Is it possible to use string functions as well? I
> know MIN() & MAX() can be asciibetical for string fields, but wouldn't
> this be very handy/practical?
>
> SELECT division,
> G_CONCAT(", ",first_name) as nicks,
> COUNT(*) as num_nicks
> FROM employees
> GROUP BY division;
>
> will return:
>
> division nicks num_nicks
> -------- ----- ---------
> sales John, David, Billy 3
> accounting David, Mickey 2
> techsupp Alice, Bob, Dennis, John 4
> r&d Lisa 1
> test 0
>
> Other aggregate string functions might be G_MD5(), G_MAKE_SET(),
> G_SPAM_RATING() :-)
>
> Aggregate functions for sets might also be nifty to have sometimes.
Here you can find list of group by functions:
http://www.mysql.com/doc/en/GROUP-BY-Functions.html
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