http://www.perlmonks.org?node_id=1052966


in reply to Re^2: Seems to be a real monday
in thread Seems to be a real monday

One of the SQL gurus thought that using group by forces an order by which is not guaranteed.

Ok, it's more than half a year later, but: MySQL does this by default, see http://www.pal-blog.de/entwicklung/mysql/did-you-know-group-by-order-by-null.html