ok, i have a query that is like so....
select distinct(id), MIN(time), MAX(time), count(page), ip,
(UNIX_TIMESTAMP(MAX(time)) - UNIX_TIMESTAMP(MIN(time))) from trainingHit
group by id

and i really want to sort on the time difference, but i get an error that
states invalid use of group function if i sort on
(UNIX_TIMESTAMP(MAX(time)) - UNIX_TIMESTAMP(MIN(time))), and 0 values if i
call this something like "val" and sort on that.  But i can call it 'val'
and that is returned correctly in the result set.

Any ideas?
Thanks in advance.

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